Definition of wiseacre noun from the Oxford Advanced Learner's Dictionary

 

wiseacre

 noun
noun
BrE BrE//ˈwaɪzeɪkə(r)//
 
; NAmE NAmE//ˈwaɪzeɪkər//
 
(old-fashioned, informal, especially North American English)
 
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a person who is annoying because they are very confident and think they know a lot Word Origin late 16th cent.: from Middle Dutch wijsseggher ‘soothsayer’, probably from the Germanic base of wit ‘have knowledge’. The assimilation to acre remains unexplained.
See the Oxford Advanced American Dictionary entry: wiseacre