Definition of smart-arse in English:

smart-arse

Line breaks: smart-arse
Pronunciation: /ˈsmɑːtɑːs
 
/
(US smart-ass)

noun

informal
A person who is irritating because they behave as if they know everything.
More example sentences
  • I'm not a smart-arse who thinks he knows all the answers now, far from it.
  • Cutting, heavily ironic comedy and musical numbers ensue, best appreciated for their dazzling cleverness, not for their smart-ass, apathetic politics.
  • You could call Lee a smart-ass but he is too clever for that.

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