嘴稳

zhè shì děi zhǎo gè zuǐ wěn de rén shāng liang

这事得找个嘴稳的人商量。

We ought to talk it over with a man who can keep a secret.

zhè kě shì gè mì mì bù guò wǒ zhī dào nǐ zuǐ wěn

这可是个秘密，不过我知道你嘴稳。

This is a secret, but I know I can count on your discretion.