不管三七二十一

guǎnsānèrshí
  1. regardless of the consequences
  2. recklessly relying on a hopelessly optimistic forecast

CEDICT

  1. (colloquial) to cast all caution to the wind and act without thinking of the consequences
  2. to cast all caution to the wind and act without thinking of the consequences

Wiktionary

不顧一切不論是非情由。《醒世恆言縣令孤女》:「不管三七二十一大門。」《二刻拍案驚奇》:「老媽心性一百女兒也不他心不管三七二十一歡歡喜喜出去。」不管三七廿一」。

重編國語辭典

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