毁于一旦 Traditional 毀於一旦 huǐ yú yī dàn 🔊 ruined in a short time (esp. of sth that… + Keep this word Meanings huǐ yú yī dàn 毀於一旦 (idiom) ruined in a short time (esp. of sth that took a long time or great effort to achieve) Its characters 毁huǐto defameHSK 7–9于yúin; at; onHSK 6一yīoneHSK 1旦dàndawn; daybreak