●be in a ˈsweat1. ( be all of a ˈsweat) (informal) be wet with sweat because it is hot or you have been running, etc.满身大汗；汗流浃背◆I had to run to work this morning because I got up late. I was in a real sweat when I arrived.今天早上起晚了，我不得不跑步上班，等到了的时候我已是大汗淋漓。2. ( be in a cold ˈsweat) be very frightened or worried about sth（害怕或焦急得）一身汗，直冒冷汗◆I woke up during the night in a cold sweat worrying about the exam.半夜里我惊醒过来，为考试的事急得直冒冷汗。