闭口不谈

閉口不談
bìkǒubùtán
  1. to refuse to say anything about (idiom)
  2. to remain tight-lipped
  3. to avoid mentioning

CEDICT

Entry Composition

1 闭口 bìkǒu
  1. (literary) to close one's mouth
  2. (literary) to remain tight-lipped; to keep mum
  3. to close one's mouth
  4. to remain tight-lipped; to keep mum
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 谈 tán
  1. to speak
  2. to talk
  3. to converse
  4. to chat
  5. to discuss

Related entries

绝口不提 juékǒubùtí (idiom) to avoid mentioning
讳 huì
  1. to avoid mentioning
  2. taboo word
  3. name of deceased emperor or superior