(used with an adjective 与形容词连用 a person who sleeps in a particular way 睡得…的人 a heavy/light/sound sleeper 睡得很沉／轻／香的人
a person who is asleep 睡觉者；睡眠者 a night train with beds for passengers on it 卧铺列车 the London–Edinburgh sleeper 伦敦到爱丁堡的卧铺列车 I came up last night on the sleeper. 昨晚我上了卧铺。
- (also sleeping car)
a coach on a train with beds for people to sleep in 卧铺列车 - (British English) (North American English tie)
one of the heavy pieces of wood or concrete (= a hard building material) on which the rails (= metal bars) on a railway track are laid （铁路）枕木，轨枕 
- (informal, especially North American English)
a film, play or book that for a long time is not very successful and then is suddenly a success （出人意外地成功的）冷门电影（或戏剧、著作等） - (also sleeper agent)
a spy who is sent to live in a country as a normal citizen and is not used until much later 休眠间谍（暂时不从事间谍活动） The sleeper had lived in the US for two decades. 卧铺在美国生活了二十年。 He infiltrated a terrorist sleeper cell. 他渗入了恐怖分子的卧铺。
- (British English)
a ring or piece of metal that you wear in an ear that has been pierced (= had a hole made in it) to keep the hole from closing （为保持耳环孔不闭合而戴的）耳环，耳钉
