shoot one's mouth off

idiom

Definition of shoot one's mouth off

informal
: to talk foolishly, carelessly, or too much about something Try not to shoot your mouth off about this to anyone.

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“Shoot one's mouth off.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/shoot%20one%27s%20mouth%20off. Accessed 28 Nov. 2020.

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