lips are sealed, one's

One will reveal nothing, especially about a secret. For example, You can trust me with the details of the lawsuit-my lips are sealed. [Early 1900s]

Name	Pronounced	Usage
Bruce	BROOS	Scottish, English
Tianna	tee-AN-ə	English (Modern)
Hartmann	HAHRT-mahn	German
Vivyan	VIV-ee-ən	English (Rare)
Elpidius	-	Late Greek (Latinized)
Ludis	-	Latvian