14. Idioms
Chapter focus: meaning, register, collocations, natural use, and avoiding memorised language.
How to study this lesson
Read the explanation first, then say the examples aloud. Change one detail in each example, such as the subject, time, or place. Complete the practice without looking back and use the answer key to understand the reason for each answer. Finish by writing two sentences about your own life or city.
An idiom is a fixed expression whose meaning is not always predictable from its individual words, such as a piece of cake meaning “easy.” Idioms can make informal speech lively, but they are not a shortcut to a high IELTS score.
Idioms in IELTS
In Speaking, a familiar idiom can sound natural when it fits the topic and your normal way of speaking: Getting used to university life was a bit of a learning curve. Do not memorise long lists and insert them into every answer. A forced idiom may sound inaccurate or rehearsed.
In Writing, avoid conversational idioms in formal essays: The government must bite the bullet is less appropriate than The government must take difficult but necessary action. Some fixed academic expressions are useful, but they are better learned as collocations: play a role, address an issue, pose a challenge, reach a conclusion, take measures, and have a significant impact on.
Safe practice method
Learn an idiom with its meaning, register, grammar, and one natural example. Mark it as informal, neutral, or formal. Check whether it is common in British English and whether the context supports it. Never change part of an idiom unless you are certain that the variation exists.
Useful natural expressions
For Speaking, appropriate expressions include from my point of view, a turning point, once in a while, to some extent, and a learning curve. For formal Writing, prefer in the long term, a key factor, a considerable proportion, in terms of, and as a result. These are expressions, not decorations: each must communicate a precise relationship or meaning.
Practice
Replace the informal expression with a formal alternative: (a) The project cost an arm and a leg. (b) The policy was a game changer. (c) The plan went down the drain.
Possible answers: (a) The project was extremely expensive. (b) The policy had a transformative effect. (c) The plan failed or The investment produced no useful result.
IELTS transfer task
Write a short four-sentence response about an IELTS topic such as education, health, transport, technology, or the environment. Use at least two examples of the target grammar from this chapter. Underline those examples, then check that every sentence has a clear subject, a correct verb, and a meaning that is easy to understand.
Deep lesson: natural expression is more important than memorised idioms
An idiom is a fixed expression whose meaning is not always predictable from its separate words. Idioms belong to a register, meaning a level of formality. An expression can be informal, neutral, or formal. IELTS rewards appropriate communication, not the largest list of idioms.
Three questions before using an idiom
- Do I know its exact meaning?
- Is it natural for this topic and situation?
- Is its register suitable for Speaking or Writing?
Twelve expressions with safe use
| Expression | Meaning | Best use | Example |
|---|---|---|---|
| a learning curve | a period of learning | Speaking | University was a learning curve. |
| a turning point | an important change | Speaking/Writing | The course was a turning point. |
| once in a while | sometimes | Speaking | I cycle once in a while. |
| to some extent | partly | Speaking/Writing | This is true to some extent. |
| play a role | contribute | formal/neutral | Schools play a role in health. |
| address an issue | deal with a problem | formal | The policy addresses congestion. |
| pose a challenge | create difficulty | formal | Cost poses a challenge. |
| reach a conclusion | decide after thought | formal | The study reached a conclusion. |
| take measures | take action | formal | Cities must take measures. |
| have an impact on | affect | formal | Noise has an impact on sleep. |
| in the long term | over a long period | formal | It saves money in the long term. |
| a key factor | an important cause | formal | Cost is a key factor. |
Natural versus forced
Natural Speaking: Getting used to university life was a bit of a learning curve. Forced Speaking: Every answer is a piece of cake and a blessing in disguise. Formal Writing: The government should take difficult but necessary measures. Too informal for formal Writing: The government must bite the bullet.
Bengali-speaker warnings
Do not translate Bengali proverbs word for word. Do not change the fixed words in an idiom: play a role, not do a role. Learn the grammar around a collocation: have an impact on, pose a challenge to, and take measures to reduce.
Practice
A. Replace with formal language: The project cost an arm and a leg. Answer: The project was extremely expensive.
B. Complete: Education plays ___ role in social mobility. Answer: a role.
C. IELTS task: Give a one-minute Speaking answer about a difficult experience using a learning curve once. Then write the same idea as a formal Task 2 sentence without an idiom.
Professor's explanation: how to think about this grammar
Do not begin by memorising a definition. Begin by asking three questions: What job does this form do? What meaning does it add? Where does it go in the sentence? Bengali and English often arrange information differently, so direct translation can create mistakes. Build the English pattern first, then attach your idea to it.
Bengali learner warning
Many Bengali speakers understand the meaning of an English sentence but omit a small grammar word because Bengali does not always need the same word. English normally needs a clear subject and a finite verb. For example, say The number of students is increasing, not Number of students increasing. Treat articles, auxiliary verbs, plural endings, and prepositions as part of the pattern, not as optional decoration.
Three-step study method
Step 1 — Notice: underline the target form in every example. Step 2 — Control: replace only one part of the example, such as the subject or time. Step 3 — Communicate: use the form in a short answer about education, health, transport, technology, or the environment. If you cannot explain why you chose the form, return to Step 1.
Practice ladder
Level 1: Recognition. Find the target form and name its job. Level 2: Controlled production. Complete or correct a sentence using the pattern. Level 3: IELTS production. Write a short paragraph or speak for one minute. At Level 3, clarity is more important than using many different forms.
Revision checklist
Before moving on, ask: Can I explain the form in one simple sentence? Can I make a positive, negative, and question form where relevant? Can I use it with a past and a present example? Can I recognise the most common Bengali-speaker error? Can I use it naturally in one IELTS answer?