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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 know-it-all /ˈnoətˌɔl/

From: Webster's Revised Unabridged Dictionary (1913)

 Know-it-all n. One who knows everything; hence, a person who makes pretension to great knowledge, especially one whose didactic conversational habit conspicuously reveals his belief that he has superior knowledge on many subjects; a wiseacre; a know-all; -- usually ironical. [Colloq. & pejorative]
 Note: the use of this term implies that the speaker disapproves of this behavior, and may think that it is unjustified

From: WordNet (r) 2.0

      n : someone who thinks he knows everything and refuses to accept
          advice or information from others [syn: know-all]