know-it-all

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English[edit]

Alternative forms[edit]

Noun[edit]

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

  1. (pejorative) Someone who obnoxiously claims to be knowledgeable on a subject.
    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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