main idea — most important idea
collocationB1IELTS 5+neutralcommon
The most important point or message in a piece of writing, speech, or conversation.
Say it like a native
Textbook The central conceptual thrust of the text is sacrifice.
Native The main idea of the text is sacrifice.
'The main idea' is natural; 'central conceptual thrust' is academic.
Pattern: the main idea (of something)
In use
- The main idea of the article is that exercise is important for good health.study
- In my opinion, the main idea of the lecture was that technology can improve education if used correctly.IELTS speaking
Common mistake
✗ The main idea is talking about pollution.
✓ The main idea is pollution. / The text is about pollution.
An idea doesn't 'talk' — say 'the main idea is X' or 'the text is about X'.
Common collocations
the main idea (of)— of, get the, is, behind
Don't confuse it
The 'main idea' is the central message, while 'details' support or explain it.