What are some French idioms that convey the following idiom?
"Don't air your dirty laundry in public"
(meaning private matters should remain so; don't reveal secrets to the public)
https://en.wiktionary.org/wiki/air_one%27s_dirty_laundry_in_public
(or even better the Greek idiom τα εν οίκω μη εν δήμω [ta en ˈiko mi en ˈðimo]