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
Eugenios	-	Ancient Greek
Kailash	-	Indian, Hindi, Marathi
BogumiŁ	baw-GUW-meew	Polish
Arsen	-	Armenian
Nadine	na-DEEN (French), nah-DEE-nə (German), nə-DEEN (English)	French, German, English
Schumacher	['ʃu:ma:kɜ:]