Synonyms of 'mouth off'
▷ See mouth
rantDictionary, rave, spout (informal)He received a yellow card for mouthing off to the referee.
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If you declaim, you speak dramatically, as if you were acting in a theatre.
He used to declaim verse to us with immense energy.
If someone raves, they talk in an excited and uncontrolled way.
She cried and raved for weeks.
Thesaurus for mouth off from the Collins English Thesaurus
to give an opinion or speak emotionally, often without much care or consideration