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wise guy

noun
1.
Informal. a cocksure, conceited, and often insolent person; smart aleck:
He has a reputation for being a wise guy.
Also called wiseacre.
Origin
1895-1900
1895-1900, Americanism
Related forms
wise-guy, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wiseguy

wise guy

noun
1.
(informal) a person who is given to making conceited, sardonic, or insolent comments
2.
(US) a member of the Mafia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Slang definitions & phrases for wiseguy

wiseguy

noun phrase
  1. (also wise apple)A person who is ostentatiously and smugly knowing; smart aleck, smart-ass: My little brother is an irrepressible wise guy (1896+)
  2. (also wise hombre)A shrewd and knowing person; a person who is ''wised up'': The wise guys said Frank didn't stand a chance (1896+)
  3. A professional criminal, esp a mob member: The wiseguys like places they're known/ Hanging out at a neighborhood restaurant in the Italian section of Queens, the first thing he learned is that the wiseguys never talk about what they do (1970s+ Underworld)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with wiseguy
An obnoxious know-it-all, a person who makes sarcastic or annoying remarks, as in the teacher was delighted that the worst wise guy in the class was moving out of town. [ ; second half of 1800s ]
Also see: smart aleck
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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