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keep something under one's hat

Slang definitions & phrases for keep something under one's hat

keep something under one's hat

verb phrase

To keep something quiet, or a secret; keep to oneself: Payne, keep this under your hat, will you? (1885+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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