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-alls(chiefly British)smart alecks, smarties, smarty-pants, wiseacres, wiseasses, wise guys, wisenheimers(also weisenheimers)wisecrackershotshots, show-offs
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