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English definition of “mouth off (to/at sb)”

mouth off (to/at sb)

informal disapproving phrasal verb with mouth     /maʊð/ verb [T]
to speak in a rude or offensive way to someone: She's a typical teenager, coming home late at night and mouthing off to her parents.Insults and abuseTreating people or animals badly
(Definition of mouth off (to/at sb) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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