run one's mouth

as in ramble
to talk at length without sticking to a topic or getting to a point There goes Joe, running his mouth again about stuff that doesn't really matter.

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“Run one's mouth.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/run%20one%27s%20mouth. Accessed 29 Nov. 2022.

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