keep (one's) lips sealed

To not say anything (about something); to keep (something) a secret. Please keep your lips sealed about our engagement, we aren't ready to tell everybody just yet.

Common Names:

Name	Pronounced	Usage
Walther	VAHL-ter (German)	German, Ancient Germanic
Jeannie	JEE-nee	English
Amnon	-	Biblical, Biblical Hebrew, Hebrew
Yakira	-	Hebrew
Vilhelm	VEEL-helm (Finnish)	Swedish, Norwegian, Danish, Finnish, Hungarian
Esa	E-sah	Finnish