mouth off (to/at sb)informal disapproving
— phrasal verb with mouth uk /maʊð/ us /maʊð/ verb [ T ]
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(Definition of “mouth off (to/at sb)” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to (cause someone to) be in a position in which the lower part of the body is resting on a seat or other type of support, with the upper part of the body vertical