Meaning of “what an idea!” in the English Dictionary

british dictionary

"what an idea!" in British English

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what an idea!

also the idea of it! old-fashioned

something you say to show that you think a suggestion is stupid:

I can't turn up at a funeral in a pink jacket. What an idea!

(Definition of “what an idea!” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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