/'sli:pə(r); `slipɚ/
n
1 (with an adj 与形容词连用) person who sleeps in the specified way 睡觉（呈某种状态）的人
*a good/bad sleeper 睡得好[睡不好]的人
* a heavy/light sleeper, ie one whom it is hard/easy to wake up 睡觉沉[轻]的人.
2 (US tie) beam of wood or other material on which the rails of a railway, etc are fixed 轨枕; 枕木; 道木.
3 (bed or berth in a) sleeping-car 卧车（中的卧　）.
4 (Brit) small ear-ring used to keep the hole in a pierced ear open （用以保持耳环孔不封口的）小耳环.
5 (US infml 口) play, book, person, etc that has an unexpected success, esp after being overlooked or unnoticed 未料到获得成功的剧、书、人等（尤指未受重视的）.

n[C]
someone who sleeps in a particular way
light sleeper
(=someone who wakes easily)
heavy sleeper
(=someone who does not wake easily)
someone who is asleep
sleeper
BrE a heavy piece of wood or concrete that supports a railway track
American Equivalent: tie
a) a night train with carriages that have beds for passengers to sleep in
b) a sleeping car
c)AmE a bed on a train for a passenger to sleep in
especially AmE a film, book etc which is successful, even though people did not expect it to be
AmE a piece of clothing for a baby that covers its whole body including its feet
a spy who is sent to a particular place and who lives an ordinary life there until a later time, when they begin their spying activities