keep under one's hat

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]

Common Names:

Name	Pronounced	Usage
Klaudiusz	KLOWT-yuwsh	Polish
Ulysse	-	French
Carolus	-	Ancient Germanic (Latinized)
Sedef	-	Turkish
Beyza	-	Turkish
Astell	['æstl]