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what's the big idea. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Phrase
what's the big idea?
- (US, colloquial, often preceded by hey) Used to express surprise or dissatisfaction with an action or statement of another person, especially to that person.
- I heard you been chatting up my girl. What's the big idea?
- Hey, what's the big idea, you telling everybody I'd left town?
Usage notes
- Although the question can be read as "What is the purpose ('big idea') of what you just said or did?", it is almost exclusively used to object to whatever was just said or done by the hearer.
References