(chiefly, US, pejorative) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc.
(chiefly, US, pejorative) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.
We had it all figured out, but this know-it-all marched in with "the correct way of solving it", leaving our experiment in shambles.
“You think she's a know-it-all She thinks you're... a lot of things”
“look, im not trying to be a know-it-all, but i do know everything so if people would simply consider things i say then it'd be a hell of a lot easier”
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(US, derogatory) One with intellectual pretensions.