as in to speak
to talk as if giving an important and formal speech
some crank mouthing off in the center of town to anyone who would listen
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“Mouth (off).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/mouth%20%28off%29. Accessed 28 Sep. 2023.
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Merriam-Webster unabridged
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