mouth off
phrasal verb
mouthed off; mouthing off; mouths off
Definition of mouth off
informal
: to talk in a loud, unpleasant, or rude way
He got in trouble again for mouthing off to his teacher. She's always mouthing off about how much better she could run the company herself.
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From the Editors at Merriam-Webster
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“Mouth off.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mouth%20off. Accessed 19 Aug. 2022.
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