(extremely) urgent;imperative; posthaste ❍ 今晚我又接到兵部～的檄文，催促勤王。(姚雪垠《李自成》 Ⅰ—226) This evening I received another urgent summons from the Ministry of War. ❍ 这是野战军首长拍来的～的电报。(吴强《红日》87) This is a most urgent telegram from the Field Army Headquarters.
十万火急
posthaste;most urgent;express
十万火急shí wàn huǒ jí
形容情况非常紧急，刻不容缓。post haste, express, urgent, in great haste