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



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 Originlate 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