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Know it all

English Vocabulary tips & definition with Gymglish.
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a know-it-all: a person who claims to know everything and rejects information from others
Icarus is a real know-it-all when it comes to accounting, he knows everything there is to know.

Know-it-all often has a sarcastic meaning:

He thinks he's a know-it-all, but he actually knows very little.

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