smart mouthnoun [ C usually singular ]uk /ˈsmɑːt ˌmaʊθ/ us /ˈsmɑːrt ˌmaʊθ/ US informal
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adjective uk /ˌsmɑːtˈmaʊðd/ us /ˌsmɑːrt-/
a smart-mouthed little brat
(Definition of “smart mouth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a group of people, especially within a political party, who try to encourage other people to follow a new, more interesting, or more active way of doing things