know-it-all

know-it-all {n.}

A person who acts as if he knows all about everything; someone who thinks no one can tell him anything new.

After George was elected as class president, he wouldn't take suggestions from anyone; he became a know-it-all.

- Also used like an adjective.

The other students didn't like George's know-it-all attitude.

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Source: A Dictionary of American Idioms

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