someone's lips are sealed
idiom
informal
—used to say that someone will not tell secret information to anyone
Your secret is safe with me: my lips are sealed.
Cite this Entry
“Someone's lips are sealed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/someone%27s%20lips%20are%20sealed. Accessed 1 Dec. 2025.
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Merriam-Webster unabridged
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