Meaning of “mouth off (to/at sb)” in the English Dictionary

british dictionary

"mouth off (to/at sb)" in British English

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mouth off (to/at sb)

informal disapproving
phrasal verb with mouth uk /maʊð/ us /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.

(Definition of “mouth off (to/at sb)” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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