gǒu​zuǐ​lǐ​tǔ​bù​chū​xiàng​yá

nothing nice comes from a filthy mouth

Senses

狗嘴里吐不出象牙/ 狗嘴裡吐不出象牙 gǒu​zuǐ​lǐ​tǔ​bù​chū​xiàng​yá nothing nice comes from a filthy mouth

A mean person never has a good word to say; used to insult someone whose speech is crude or unpleasant.

References

variant 狗嘴里吐不出象牙/狗嘴裡吐不出象牙 狗口里吐不出象牙/狗口裡吐不出象牙