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
Colene	kah-LEEN	English (Rare)
Herleifr	-	Ancient Scandinavian
Ayako	ah-yah-ko	Japanese
Taniqua	tə-NEE-kwə	African American (Rare)
Vedrana	-	Croatian, Serbian
Ismail	-	Arabic, Uyghur