Meaning of know-it-all

know-it-all

Pronunciation: (nō'it ôl"), [key]
— n.
  1. a person who acts as though he or she knows everything and who dismisses the opinions, comments, or suggestions of others.
—adj.
  1. of or characteristic of a know-it-all.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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