informal + disapprovinga person who talks and behaves like someone who knows everythingMy neighbor is a real know-it-all, always telling me what to do.
My neighbor is a real know-it-all, always telling me what to do.
know-all(chiefly British)smart aleck, smarty(or smartie), smarty-pants, wiseacre, wiseass, wise guy, wisenheimer(also weisenheimer)wisecrackerhotshot, show-off
in 1873
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