免开尊口

zhè shì nǐ zuì hǎo miǎn kāi zūn kǒu

这事你最好免开尊口。

You'd better not say anything about this matter.

zhè shì ràng tā chū miàn nǐ jiù miǎn kāi zūn kǒu

这事让他出面，你就免开尊口。

Better to keep silent and leave this matter to him.

dāng jǐng guān wèn qǐ hái yǒu shén me yì jiàn shí zuì hǎo miǎn kāi zūn kǒu

当警官问起还有什么意见时，最好免开尊口。

When the sergeant asks if there are any complaints, silence is golden.