like: 守口如瓶 → →
守口如瓶 [shou3 kou3 ru2 ping2] ☊ 
lit. to guard one's mouth like a closed bottle (idiom); tight-lipped ☊ 
Geheimhaltung (S) ☊ 守口如瓶 [shou3 kou3 ru2 ping2] ☊ lit. to guard one's mouth like a closed bottle (idiom); tight-lipped ☊ Geheimhaltung (S) ☊