Word: 当机立断 (dāngjīlìduàn) Traditional: 當機立斷 当机立断 dictionary entry dāngjīlìduàn to make prompt decisions (idiom) Full dictionary entry for 当机立断 Example sentences using 当机立断 2 sentences, showing page 1 of 1. 做事为什么不能当机立断呢？ Zuòshì wèishénme bùnéng dāngjīlìduàn ne? Why can't you be decisive when you do things? 遇到危险时，必须当机立断。 Yùdào wēixiǎn shí, bìxū dāngjīlìduàn. When you face danger, you have to decide quickly.