Vocabulary Learning

Idiomatic Expressions in English: What They Are and How to Use Them

#idioms #idiomatic expressions #english phrases #figurative language

You can know every word in “She let the cat out of the bag” and still have no idea what the sentence means. That’s because it’s an idiomatic expression — a phrase whose meaning cannot be understood from the individual words. The sentence has nothing to do with cats or bags. It means “she revealed a secret.”

Idiomatic expressions are everywhere in English. Native speakers use them in every conversation, email, meeting, and text message — often without realizing it. For learners, this creates a frustrating gap: your grammar is correct, your vocabulary is solid, but half the things people say seem to make no sense.

This guide explains what idiomatic expressions actually are, how they work, what types exist, and — most importantly — how to learn and use them. It includes 100+ examples organized by type and topic, with clear meanings and natural sentences.

What you’ll learn: definition, types, and structure of idiomatic expressions
Examples included: 100+ idiomatic expressions with meanings
Level: B1–C1
For: understanding natural English, exam prep, conversation fluency

For a complete list of 500+ English idioms, see English Idioms: 500+ Common Expressions.

What Is an Idiomatic Expression?

An idiomatic expression (also called an idiom) is a phrase or sentence whose meaning is different from the literal meaning of its individual words.

Expression	Literal Meaning	Actual (Idiomatic) Meaning
break the ice	physically break ice	start a conversation in an awkward situation
hit the nail on the head	hammer a nail	say something exactly right
under the weather	beneath the weather	feeling sick
piece of cake	a slice of cake	something very easy
cost an arm and a leg	lose body parts as payment	be very expensive

The key characteristic: you cannot guess the meaning from the words. If someone says “It’s a piece of cake,” they are not talking about dessert. If someone says “He kicked the bucket,” they are not talking about kicking anything — they mean he died.

This is what makes idioms different from other types of phrases. A phrase like “heavy rain” uses “heavy” metaphorically, but you can still guess the meaning. With idioms, guessing from the words is impossible.

Idiomatic vs. Literal Language

Feature	Literal Language	Idiomatic Language
Meaning	matches the words	differs from the words
Predictable?	yes	no
Translatable?	word-for-word	must translate the meaning
Example	“She closed the door”	“She let the cat out of the bag”

Why Do Idiomatic Expressions Exist?

Every language has idioms. They develop naturally over centuries for several reasons:

1. Efficiency. “He kicked the bucket” is shorter and more vivid than “He died.” Idioms compress complex ideas into compact phrases.

2. Shared cultural experience. Many idioms come from specific historical activities — farming (“separate the wheat from the chaff”), sailing (“learn the ropes”), sports (“move the goalposts”), or war (“bury the hatchet”). The original context fades, but the expression survives.

3. Emotional color. “I’m a bit tired” is neutral. “I’m running on empty” paints a picture. Idioms add emotional depth and personality to language.

4. Social bonding. Using idioms signals that you belong to a speech community. When a colleague says “Let’s not reinvent the wheel,” everyone who knows the idiom feels connected. Idioms are cultural passwords.

Types of Idiomatic Expressions

Not all idioms work the same way. Understanding the different types helps you recognize and learn them more efficiently.

1. Pure Idioms (Opaque)

The meaning has no connection to the literal words. You cannot guess the meaning at all.

Idiom	Meaning
kick the bucket	die
spill the beans	reveal a secret
bite the bullet	endure something painful
break a leg	good luck
by the skin of your teeth	barely, just in time
once in a blue moon	very rarely
the whole nine yards	everything, the full amount
fly off the handle	become suddenly angry

These are the hardest to learn because there is no logical bridge between the words and the meaning. You must memorize them.

2. Semi-Transparent Idioms

The meaning is partially guessable from the words. There is a metaphorical connection, but it’s not obvious.

Idiom	Meaning	Why Semi-Transparent
break the ice	start a conversation	ice = social coldness/awkwardness
see eye to eye	agree completely	eyes meeting = mutual understanding
burn bridges	damage a relationship permanently	bridge = connection
light at the end of the tunnel	hope after difficulty	tunnel = dark period
turn over a new leaf	make a fresh start	leaf = page in a book
let sleeping dogs lie	don’t disturb a calm situation	sleeping = peaceful
hit the nail on the head	say something exactly right	nail = the point
beat around the bush	avoid the main topic	bush = the point

These are easier to remember because the metaphor gives you a mental hook.

3. Phrasal Verb Idioms

Many phrasal verbs are idiomatic — their meaning cannot be guessed from the verb + particle combination.

Phrasal Verb	Meaning
give up	stop trying
look up to	admire and respect
put up with	tolerate
get away with	avoid punishment
run into	meet unexpectedly
come across	find by chance
bring up	mention a topic; raise a child
figure out	understand after thinking

For a deep dive into phrasal verbs, see Phrasal Verbs with GET and English Phrasal Verbs: Complete Guide.

4. Proverbs and Sayings

Proverbs are complete sentences that express a general truth or piece of advice. Many are idiomatic.

Proverb	Meaning
Don’t put all your eggs in one basket.	Don’t risk everything on a single plan.
The early bird catches the worm.	Success comes to those who act first.
Every cloud has a silver lining.	Something good can come from a bad situation.
Don’t count your chickens before they hatch.	Don’t assume success before it happens.
Actions speak louder than words.	What you do matters more than what you say.
When in Rome, do as the Romans do.	Adapt to local customs.
The grass is always greener on the other side.	Other situations always seem better.
You can’t judge a book by its cover.	Appearances can be deceiving.

5. Binomial Idioms (Pairs)

Two words joined by “and” or “or” in a fixed order.

Binomial	Meaning
pros and cons	advantages and disadvantages
give and take	mutual compromise
now and then	occasionally
sick and tired	completely fed up
odds and ends	miscellaneous small items
by and large	generally, mostly
sooner or later	eventually
more or less	approximately

The word order is fixed: “pros and cons” is correct; “cons and pros” sounds wrong.

Types of idiomatic expressions: pure idioms, semi-transparent, phrasal verbs, proverbs, and binomials

100 Essential Idiomatic Expressions by Topic

Everyday Life

#	Expression	Meaning	Example
1	a piece of cake	very easy	The test was a piece of cake.
2	break the ice	start a conversation	He told a joke to break the ice.
3	call it a day	stop working	We’ve done enough — let’s call it a day.
4	get out of hand	become uncontrollable	The party got out of hand quickly.
5	in the long run	over a long period of time	Exercise pays off in the long run.
6	on the same page	in agreement	Let’s make sure we’re all on the same page.
7	the last straw	the final problem that causes a reaction	His late arrival was the last straw.
8	at the end of the day	ultimately	At the end of the day, family matters most.
9	give it a shot	try	I’ve never done it, but I’ll give it a shot.
10	no-brainer	an easy decision	Accepting the scholarship was a no-brainer.

Success and Failure

#	Expression	Meaning	Example
11	hit the nail on the head	be exactly right	You hit the nail on the head with that analysis.
12	back to square one	start over	The plan failed, so we’re back to square one.
13	cut corners	do something cheaply or improperly	They cut corners on safety to save money.
14	go the extra mile	make more effort than required	She always goes the extra mile for her clients.
15	miss the boat	miss an opportunity	If you don’t apply now, you’ll miss the boat.
16	the ball is in your court	it’s your decision/turn	I’ve made my offer — the ball is in your court.
17	learn the ropes	learn the basics of a job	It took a month to learn the ropes.
18	throw in the towel	give up	After three failed attempts, he threw in the towel.
19	up in the air	uncertain, undecided	Our vacation plans are still up in the air.
20	ahead of the curve	more advanced than others	Their technology is ahead of the curve.

Money and Business

#	Expression	Meaning	Example
21	cost an arm and a leg	be very expensive	The repair cost an arm and a leg.
22	break the bank	be too expensive	A weekend trip doesn’t have to break the bank.
23	make ends meet	have just enough money	It’s hard to make ends meet on minimum wage.
24	penny for your thoughts	what are you thinking?	You look worried — penny for your thoughts?
25	get the ball rolling	start a process	Let’s get the ball rolling on this project.
26	in the red	in debt, losing money	The company has been in the red for two quarters.
27	bring to the table	contribute	What skills do you bring to the table?
28	think outside the box	be creative	We need to think outside the box to solve this.
29	the bottom line	the most important point	The bottom line is we need more revenue.
30	a ballpark figure	an approximate estimate	Give me a ballpark figure for the project cost.

Emotions and Feelings

#	Expression	Meaning	Example
31	on cloud nine	extremely happy	She’s been on cloud nine since the proposal.
32	under the weather	feeling sick	I’m feeling under the weather today.
33	over the moon	extremely happy	They were over the moon about the baby.
34	down in the dumps	sad, depressed	He’s been down in the dumps since the breakup.
35	butterflies in my stomach	nervous excitement	I always get butterflies before a presentation.
36	blow off steam	release stress or anger	I go for a run to blow off steam.
37	keep a stiff upper lip	remain calm under pressure	The British are famous for keeping a stiff upper lip.
38	lose your cool	become angry or upset	Try not to lose your cool during the interview.
39	get cold feet	become nervous before a big event	He got cold feet before the wedding.
40	have a heart of gold	be very kind and generous	Despite her tough exterior, she has a heart of gold.

Communication

#	Expression	Meaning	Example
41	beat around the bush	avoid the main topic	Stop beating around the bush and tell me the truth.
42	spill the beans	reveal a secret	Someone spilled the beans about the surprise party.
43	get straight to the point	talk about the main issue directly	I’ll get straight to the point — we need to cut costs.
44	speak your mind	say what you truly think	She’s not afraid to speak her mind.
45	read between the lines	understand the hidden meaning	You have to read between the lines of his email.
46	keep someone in the loop	inform someone regularly	Please keep me in the loop on any developments.
47	ring a bell	sound familiar	The name rings a bell, but I can’t place it.
48	word of mouth	information spread through conversation	The restaurant became famous through word of mouth.
49	take with a grain of salt	don’t believe everything	Take his claims with a grain of salt.
50	cut to the chase	get to the point	Let’s cut to the chase — what do you want?

Relationships

#	Expression	Meaning	Example
51	see eye to eye	agree completely	We don’t always see eye to eye on politics.
52	get along like a house on fire	become friends immediately	They got along like a house on fire.
53	stab in the back	betray someone	I can’t believe he stabbed me in the back.
54	give someone the cold shoulder	deliberately ignore someone	She gave him the cold shoulder after the argument.
55	bend over backwards	try very hard to help	She bent over backwards to make us comfortable.
56	bury the hatchet	make peace, end a conflict	It’s time to bury the hatchet and move on.
57	a shoulder to cry on	someone who listens to your problems	She’s always been a shoulder to cry on.
58	give someone the benefit of the doubt	trust someone despite uncertainty	I’ll give him the benefit of the doubt this time.
59	hit it off	immediately get along	We hit it off on our first date.
60	two-faced	insincere, hypocritical	She’s two-faced — nice to you, then talks behind your back.

Time

#	Expression	Meaning	Example
61	in the nick of time	just barely in time	We arrived at the airport in the nick of time.
62	once in a blue moon	very rarely	I only eat fast food once in a blue moon.
63	around the clock	24 hours a day	The team worked around the clock to finish.
64	at the eleventh hour	at the last possible moment	The deal was saved at the eleventh hour.
65	time flies	time passes quickly	Time flies when you’re having fun.
66	kill time	do something while waiting	I killed time by reading a magazine.
67	behind the times	old-fashioned	His management style is behind the times.
68	stand the test of time	remain relevant or effective	Their friendship has stood the test of time.
69	ahead of time	earlier than expected	She finished the project ahead of time.
70	rain or shine	no matter what	We’ll be there, rain or shine.

Knowledge and Learning

#	Expression	Meaning	Example
71	learn the hard way	learn from painful experience	He learned the hard way not to trust strangers online.
72	a steep learning curve	difficult to learn at first	There’s a steep learning curve with this software.
73	know something inside out	know something thoroughly	She knows the industry inside out.
74	pick someone’s brain	ask for advice or information	Can I pick your brain about the marketing strategy?
75	food for thought	something to think about	Your proposal is food for thought.
76	in a nutshell	in summary	In a nutshell, we need more time and money.
77	get the hang of it	learn how to do something	It takes a few weeks to get the hang of it.
78	scratch the surface	deal with only a small part	We’ve barely scratched the surface of this topic.
79	do your homework	research before making a decision	Make sure you do your homework before investing.
80	the tip of the iceberg	only a small visible part	What we found is just the tip of the iceberg.

Difficulty and Problems

#	Expression	Meaning	Example
81	between a rock and a hard place	in a difficult situation with no good options	He’s between a rock and a hard place.
82	the elephant in the room	an obvious problem nobody mentions	The company’s debt is the elephant in the room.
83	at the end of your rope	at the limit of patience or endurance	I’m at the end of my rope with this project.
84	a can of worms	a complicated situation	That question opened a whole can of worms.
85	add fuel to the fire	make a bad situation worse	His comments only added fuel to the fire.
86	a blessing in disguise	something bad that turns out good	Losing that job was a blessing in disguise.
87	burn the midnight oil	work late into the night	Students burn the midnight oil before finals.
88	weather the storm	survive a difficult period	The company managed to weather the storm.
89	nip it in the bud	stop a problem early	Address the issue now — nip it in the bud.
90	turn a blind eye	deliberately ignore something	Management turned a blind eye to the violations.

Actions and Decisions

#	Expression	Meaning	Example
91	bite the bullet	endure something difficult	I bit the bullet and booked the dentist appointment.
92	pull someone’s leg	joke with someone	I’m just pulling your leg — I didn’t really quit.
93	let the cat out of the bag	reveal a secret	Who let the cat out of the bag about the surprise?
94	play it by ear	decide as you go	We don’t have a plan — let’s play it by ear.
95	sit on the fence	not make a decision	Stop sitting on the fence and choose a side.
96	take it with a pinch of salt	don’t fully believe it	Take online reviews with a pinch of salt.
97	bite off more than you can chew	take on too much	I think I bit off more than I could chew with this project.
98	jump on the bandwagon	follow a popular trend	Everyone’s jumping on the AI bandwagon.
99	cross that bridge when you come to it	deal with problems when they arise	Don’t worry about it now — cross that bridge when you come to it.
100	leave no stone unturned	search everywhere, try everything	The police left no stone unturned in their investigation.

How Idiomatic Expressions Work in Grammar

Idioms follow specific grammatical rules. Understanding these rules helps you use idioms correctly — not just recognize them.

Fixed vs. Flexible Structure

Some idioms are completely fixed — you cannot change any word:

Fixed: by and large, once in a blue moon, under the weather
You CANNOT say: “under a weather” or “once in a red moon”

Others allow some grammatical changes (tense, pronoun):

Flexible: break the ice → She broke the ice. / The ice was broken.
Flexible: spill the beans → He spilled the beans. / Don’t spill the beans.

Separable vs. Inseparable

Some idiomatic phrasal verbs can be separated; others cannot:

Type	Example	Separated Form
Separable	figure out	She figured it out.
Separable	bring up	He brought the topic up.
Inseparable	run into	I ran into her. (NOT: I ran her into.)
Inseparable	look up to	I look up to my teacher.

Noun-Phrase Idioms

Some idioms function as nouns:

It’s a piece of cake. (subject complement)
That’s the tip of the iceberg. (subject complement)
He’s a jack of all trades. (subject complement)

Common Mistakes with Idiomatic Expressions

Mistake	Correct Form	Problem
“under weather”	under the weather	Missing article
“break the legs”	break a leg	Wrong article + wrong number
“it costs arm and leg”	it costs an arm and a leg	Missing articles
“I’m on the cloud nine”	I’m on cloud nine	Extra article
“by large”	by and large	Missing “and”
“He bit the dust” (= died)	He bit the dust	Not a mistake — but using death idioms casually is insensitive

The most important rule: learn idioms as complete phrases, not word-by-word. Treat each idiom as a single vocabulary item.

How to learn and use idiomatic expressions effectively

How to Learn Idiomatic Expressions

Step 1: Learn in Context

Never memorize idioms from isolated lists. Read them in articles, watch them in movies, listen for them in podcasts. When you encounter an idiom naturally, the context helps you remember both the meaning and the usage.

Step 2: Group by Topic

Learning “body idioms” together (break a leg, cold shoulder, heart of gold) is more effective than random lists. Your brain creates a mental category, and each new idiom reinforces the others.

Step 3: Create Example Sentences

For each idiom you learn, write 2–3 sentences about your own life. “I got butterflies in my stomach before my job interview” is personal and memorable. Generic examples fade quickly.

Step 4: Practice Active Use

Use idioms in conversation and writing deliberately. Start with safe ones (piece of cake, in the long run, at the end of the day) before moving to more colorful ones. If you never use an idiom actively, you will never own it.

Step 5: Use Spaced Repetition

Add idioms to your Linglify vocabulary. The system tests you at increasing intervals, moving idioms from short-term to long-term memory automatically.

Words to Practice

boom

noun