家丑不可外传，流言切莫轻信
jiā chǒu bù kě wài chuán , liú yán qiē mò qīng xìn

Translation

  • Don't spread abroad the shame of the family, don't believe rumors lightly (common expression)
  • Don't wash your dirty linen in public, don't listen to others' gossip.
Chinese Tones