Do not wash your dirty linen in public.

不要在稠人广众下洗脏衣服。

The saying, "Don't wash your dirty linen in public," specifically tells us that we should not discuss intimate family matters in public, especially if they are of a shameful nature.

俗云：“家丑不可外扬”，它明确地提醒我们不应在公众场合讨论私人的家务事，特别是如果那些事本来就不是很光彩的话。