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
Emrys	-	Welsh
Iomhar	-	Scottish
Seraphinus	-	Late Roman
Titus	TI-tuws (Ancient Roman), TIE-təs (English)	Ancient Roman, English, Biblical, Biblical Latin
Azazias	-	Biblical Latin
Fryderyk	fri-DER-ik	Polish