keep one's lips sealed

Verb

 * 1)  To keep quiet; to keep a secret; to not tell.
 * You can certainly trust me to keep my lips sealed about the matter.

Translations

 * Chinese:
 * Mandarin:
 * Finnish: sinetöidä huulensa
 * French: ne rien dire,
 * Hungarian: hallgat, mint a sír
 * Polish:
 * Russian: ,
 * Spanish: no soltar prenda