GNU Collaborative International Dictionary of English

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1.       
   Wiseacre , n. [OD. wijssegger or G. weissager a foreteller, prophet, from weissagen to foretell, to prophesy, OHG. wīssagn, corrupted (as if compounded of the words for wise and say) fr. wīzzagn, fr. wīzzag a prophet, akin to AS. wītiga, wītga, from the root of E. wit. See Wit, v.]
   1913 Webster
   A learned or wise man. [Obs.]
   1913 Webster
   Pythagoras learned much . . . becoming a mighty wiseacre.
   Leland.
   
   1913 Webster
   One who makes undue pretensions to wisdom; a would-be-wise person; hence, in contempt, a simpleton; a dunce.
   1913 Webster