'Know-all' definitions:

Definition of 'know-all'

From: WordNet
noun
Someone who thinks he knows everything and refuses to accept advice or information from others [syn: know-it- all, know-all]

Definition of 'Know-all'

From: GCIDE
  • Know-all \Know"-all`\, n. One who knows everything; hence, one who makes pretension to great knowledge; a wiseacre; a know-it-all; -- usually ironical. [Colloq. or R.] [1913 Webster]