keep (something) under one's hat

idiom

: to keep (something) secret : to not tell anyone about (something)
I'll tell you what happened, but you have to keep it under your hat.

Dictionary Entries Near keep (something) under one's hat

Cite this Entry

“Keep (something) under one's hat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keep%20%28something%29%20under%20one%27s%20hat. Accessed 20 Jul. 2024.

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