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Definition of wise guy noun from the Oxford Advanced Learner's Dictionary

wise guy

noun
 
/ˈwaɪz ɡaɪ/
 
/ˈwaɪz ɡaɪ/
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  1. (especially North American English, informal, disapproving) a person who speaks or behaves as if they know more than other people synonym know-all
    • OK, wise guy, what do we do now?
  2. (US English, slang) a member of the Mafia
See wise guy in the Oxford Advanced American Dictionary
previously
adverb
 
 
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