不吐不快

bùtǔbùkuài
to have to pour out what's on one's mind (idiom)

CEDICT

to have to get something off one's chest; to have to say something to feel comfortable

Wiktionary

心中的事不吐露发洩会感到不畅快。

重編國語辭典

心中的事不吐露发洩就感到不畅快

維基詞典

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 吐 tǔ
  1. to spit
  2. to send out (silk from a silkworm, bolls from cotton flowers etc)
  3. to say
  4. to pour out (one's grievances)
3 不快 bùkuài
  1. unhappy
  2. in low spirits
  3. (of a knife) not sharp