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lips are sealed, one's

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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]

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

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