wise guy

US /ˈwaɪz ˌɡaɪ/
UK /ˈwaɪz ˌɡaɪ/
"wise guy" picture
1.

a person who is irritating because they think they know everything and try to be clever

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Don't be such a wise guy, just answer the question.
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He always has a sarcastic comment, a real wise guy.
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guyguiwisewiselya word to the wisea word to the wise is sufficientbe wise after the event