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know-it-all [know-it-alls]▼(someone who obnoxiously claims to be knowledgeable on a subject)noun[UK: nəʊ ɪt ɔːl] [US: ˈnoʊ ˈɪt ɔːl]
smart aleck▼(a know-it-all)noun[UK: ˈsmɑːt.ˈæ.lɪk] [US: ˈsmɑːt.ˈæ.lɪk]
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