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
Durham	['dʌrəm]
Ruwa	-	Arabic
Inga	ING-ah (Swedish), ING-gah (German), EEN-gah (Russian)	Swedish, Danish, Norwegian, Icelandic, Latvian, Lithuanian, German, Russian, Ancient Scandinavian, A
Lyra	LIE-rə (English), LEE-rə (English)	Astronomy
Decker	['dekə]
Baldrick	['bɔ:ldrik]