Have A Big Mouth Definition & Meaning - Merriam-Webster

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have a big mouth

idiom

informal : to be likely to reveal personal or confidential information to other people Be careful of what you say around her—she has a big mouth.

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“Have a big mouth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/have%20a%20big%20mouth. Accessed 7 Jan. 2026.

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