天晚了才进食,天未亮即起床穿衣。比喻勤劳忙碌。《唐・陈鸿・长恨传》:“玄宗在位岁久,倦于旰食宵衣。”亦作“宵衣旰食”、“昃食宵衣”。
英语 getting up before dawn and eating late (busy with state affairs)