gǒu​zuǐ​li​tǔ​bù​chū​xiàng​yá

a filthy mouth cannot utter decent language

狗嘴里吐不出象牙 狗嘴裏吐不出象牙 gǒu​zuǐ​li​tǔ​bù​chū​xiàng​yá
a filthy mouth cannot utter decent language
literally translated as "no ivory comes from the mouth of a dog"; one cannot expect decent or polite words from a person with a vulgar or malicious characterless mind

Frequency

Written text
0.057 per million

Sources

Frequency data
BCC Corpus (BLCU)