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lips are sealed, one's

Idioms  

  1. One will reveal nothing, especially about a secret. For example, You can trust me with the details of the lawsuit—my lips are sealed. [Early 1900s]

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.