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English definition of “mouth off (about sth)”

mouth off (about sth)

informal disapproving phrasal verb with mouth     /maʊð/ verb [T]
to express your opinions too loudly and publicly: I had to listen to Michael mouthing off about the government all through lunch.Talking angrily
(Definition of mouth off (about sth) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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