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English definition of “bad-mouth”

bad-mouth

verb [T]     /ˈbæd.maʊθ/ informal
to criticize someone or something in a very unpleasant manner: Stop bad-mouthing him all the time.Disapproving and criticizingDamaging reputation
(Definition of bad-mouth verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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