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]
keep under one's hat
| Idioms: keep under one's hat |
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 | keep to oneself (Idiom) |
| hat (Idiom) |
| under (Idiom) |
 | What to do when you like a guy but he's one of the guys hat keep it a secret? Read answer... |
| What do you keep a hat in? Read answer... |
| How does a hat keep you warm? Read answer... |
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 | Idioms. The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved. Read more |
Related answers
- What does keep something under your hat mean?
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