jiā​chǒu​bù​kě​wài​yáng

don't wash your dirty linen in public

家丑不可外扬 家醜不可外揚 jiā​chǒu​bù​kě​wài​yáng
don't wash your dirty linen in public
Literally means family shames should not be spread abroad; used as an idiom to mean that internal or shameful matters should not be shared with outsiders.

Frequency

Written text
0.148 per million

Sources

Frequency data
BCC Corpus (BLCU)