wash one's dirty linen(in public)(或at home)

用作动词的意思： (在公开场合或在家里)谈论、争论隐私

用法及例句：
I don't know why both of them were such a pair of idiots. They washed their dirty linen in public.我不明白,他们俩当时怎么会那么愚。他们居然在公开场合谈论家里的丑事。

Stop your talking. Wash your dirty linen at home, you know?你别再说了。家丑不可外扬，知道吗？

英汉词典参考：  

wash  

one  

dirty  

linen  

in  

public  

at  

home