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NounEdit

know-it-all (plural know-it-alls)

  1. (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.

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