don't wash your dirty linen in public
Do not discuss very private, personal matters, especially those that may be embarrassing, in public or with other people. Hey, please don't wash your dirty linen in public—it makes me uncomfortable.
Do not wash your dirty linen in public.
Prov. Do not talk about your private family problems in public. Grandson: How are we going to make Dad stop drinking? Grandmother: Hush! Don't wash your dirty linen in public.