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
Aina (1)	IE-nah (Finnish, Swedish)	Finnish, Swedish, Norwegian, Danish
Madonna	[mə'dɔnə]
Andriana	-	Greek
Sarita (1)	-	Spanish
Roc	RAWK	Catalan
TÓMas	-	Icelandic