someone's lips are sealed

idiom

Definition of someone's lips are sealed

informal
used to say that someone will not tell secret information to anyoneYour secret is safe with me: my lips are sealed.

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“Someone's lips are sealed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/someone%27s%20lips%20are%20sealed. Accessed 23 Nov. 2020.

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