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View synonyms for keep under one's hat
keep under one's hat
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Idioms and Phrases
Preserve the secrecy of something, as in I'll tell you about it if you promise to keep it under your hat . This usage alludes to hiding a secret in one's head, covered by a hat. [Late 1800s]Advertisement
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.
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