当机立断

當機立斷
dāngduàn
to make prompt decisions (idiom)

CEDICT

  1. (literally) of an electronic device: crashed and immediately disconnected
  2. of an electronic device: crashed and immediately disconnected
  3. to be decisive and make a decision promptly at a critical moment

Wiktionary

抓住时机立刻作出决断:「村长风雨交加水位上升当机立断村民赶快撤离。」应机立断」。

重編國語辭典

当下立刻作出决断毫不迟疑

維基詞典

Entry Composition