一ㄧ不ㄅㄨˊ做ㄗㄨㄛˋyībúzuò，二ㄦˋ不ㄅㄨˋ休ㄒㄧㄡèrbùxiū

yībùzuò, èrbùxiūㄧ　ㄅㄨˋ ㄗㄨㄛˋ，ㄦˋ ㄅㄨˋ ㄒㄧㄡ

  1. 要麼不做，要做就索性做到底。例 「一不做，二不休，既然已經出發，就勇往直前吧」。

英don't do it, or don't rest (idiom)​; either give up, or go through to the end, Since we started, we must carry it through whatever happens., in for a penny, in for a pound