The most common English idioms explained clearly, everyday, business and time idioms, with guidance on using them naturally and exam practice.
An idiom is a fixed phrase whose meaning can't be worked out from the individual words, "break the ice" has nothing literally to do with breaking anything. Idioms are one of the clearest markers of natural, native-like English, but they're also one of the easiest things to overuse or use incorrectly, since they're fixed: you can't usually change the words or the grammar inside them at all.
| Idiom | Meaning | Example |
|---|---|---|
| break the ice | to start a conversation, ease tension | He told a joke to break the ice at the meeting. |
| hit the books | to study hard | I need to hit the books before my exam. |
| under the weather | feeling slightly ill | I'm feeling a bit under the weather today. |
| piece of cake | very easy | The test was a piece of cake. |
| cost an arm and a leg | very expensive | That new phone cost an arm and a leg. |
| once in a blue moon | very rarely | I only eat fast food once in a blue moon. |
| get the hang of it | to learn how to do something | It took a while, but I finally got the hang of it. |
| on the same page | in agreement, understanding each other | Let's make sure we're on the same page before we start. |
| Idiom | Meaning | Example |
|---|---|---|
| think outside the box | to think creatively, unconventionally | We need to think outside the box for this campaign. |
| touch base | to make brief contact to update each other | Let's touch base again next week. |
| ballpark figure | a rough estimate | Can you give me a ballpark figure for the total cost? |
| back to the drawing board | to start again after a failed attempt | The plan didn't work, so it's back to the drawing board. |
| get the ball rolling | to start a process | Let's get the ball rolling on this project. |
| Idiom | Meaning | Example |
|---|---|---|
| in the nick of time | just in time, at the last possible moment | We arrived in the nick of time. |
| around the clock | all day and night, continuously | The team worked around the clock to finish the project. |
| time flies | time passes quickly | Time flies when you're having fun. |
| beat the clock | to finish before a deadline | We managed to beat the clock and submit early. |
A common mistake among learners who've just discovered idioms is using too many of them at once, which sounds unnatural even to native speakers. One or two well-placed idioms in a conversation sound fluent; five in one paragraph sounds like a phrasebook.
| ❌ Incorrect | ✅ Correct | Why |
|---|---|---|
| He broke the ices at the party. | He broke the ice at the party. | Idioms are usually fixed, "ice" doesn't pluralise here even though it looks like a normal noun. |
| I have a piece of cake for exams. (meant: exams are easy) | Exams are a piece of cake for me. | The idiom needs the full fixed phrase attached correctly to what it describes. |
| Let's think outside of the box. | Let's think outside the box. | The idiom is fixed as "outside the box," not "outside of the box." |
| This report cost me an arm and two legs. | This report cost me an arm and a leg. | The idiom is fixed at "an arm and a leg," changing the numbers breaks it. |
| Exam | How This Is Tested | Sample Question |
|---|---|---|
| Cambridge B2 First / C1 Advanced | Recognising and correctly using common idioms is part of the vocabulary range assessed in Speaking and Writing. | Using "get the hang of it" naturally when describing learning a new skill. |
| IELTS Speaking (Band 7+) | Natural, appropriately-used idiomatic language is explicitly rewarded in the Lexical Resource criterion. | Using one or two idioms naturally, not forced, across a Speaking Part 2/3 answer. |
| Trinity GESE/ISE (SELT) | At higher levels, natural idiomatic expressions add authenticity to conversational answers. | "It was a piece of cake" as a natural response describing an easy task. |
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