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Noun: smart-ass  'smaart,as
Usage: N. Amer, informal (elsewhere: smart-arse)
  1. Someone being or trying to be irritatingly clever; a smart alec
    "The teacher grew tired of the smart-ass always correcting her";
    - bright spark [informal], smart-arse [Brit, Cdn, informal], smarty-boots [Brit, informal], smartypants [informal], smarty [informal], smartie [informal]
Adjective: smart-ass  'smaart,as
Usage: N. Amer, vulgar (elsewhere: smart-arse)
  1. Annoyingly clever or showing off; behaving as if knowing everything
    "His smart-ass remarks irritated everyone";
    - smart-alecky [informal]

Derived forms: smart-asses

See also: clever clogs [Brit, informal], clever Dick [Brit, informal], smart alec [informal], smart aleck [informal], weisenheimer [US, informal], wiseacre, wisenheimer [US, informal]