Meaning of “wise guy” in the English Dictionary

"wise guy" in British English

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wise guynoun [ C ]

uk /ˈwaɪz ˌɡaɪ/ us /ˈwaɪz ˌɡaɪ/ US offensive wise ass informal
wise-guy
adjective [ before noun ] us uk /ˈwaɪz.ɡaɪ/ US offensive wise-ass

wise-guy humour

(Definition of “wise guy” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)