Why memorizing 25,000 idioms might actually lower your English score

15 Idioms For IELTS Speaking Test · 4:35 · Video: Explified Labs · Watch at the source

In short: Mastering idiomatic language is a requirement for high-level English proficiency, but there is a significant trap for learners. Using the wrong expression can signal a lack of natural fluency. To succeed, you must move beyond rote memorization toward contextual integration.

To reach a Band 7 or higher within the Lexical Resource section, the official IELTS Speaking test requires candidates to employ idiomatic expressions with precision and ease. Idioms are considered a fundamental part of natural language use, sitting alongside phrasal verbs and collocations. They allow speakers to express themselves in more interesting ways and improve overall fluency. However, the sheer scale of English idiomatic expressions presents a major challenge. There are an estimated 25,000 idioms in use, many of which are restricted to specific regions or social groups. Because of this variety, randomly memorizing expressions can backfire. A student might inadvertently use an idiom that is outdated, uncommon, or simply sounds unnatural in a given context, which can negatively impact their performance.

To avoid sounding forced, examiners look for natural collocation. This means the idiom must fit the specific context of the response. For example, expressions like 'to add insult to injury' are suitable for describing everyday misfortunes, while 'barking up the wrong tree' is effective for discussing social issues or misdirected blame. The goal is to use a curated selection of common, versatile phrases—such as 'a blessing in disguise' or 'at the drop of a hat'—and practice incorporating them into real-life responses smoothly.

The objective is to unlock a higher score by using these tools to elevate spoken English without making the speech feel like a list of rehearsed phrases. Success lies in understanding the nuance of when and how to deploy these expressions to impress examiners with authentic communication.

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