sleep ‧ er /ˈsliːpə $ -ər/ BrE AmE noun [countable]
[ Word Family: noun : ↑ sleep , ↑ sleeper , ↑ sleepiness , ↑ sleeplessness ; adjective : ↑ asleep , ↑ sleepless , ↑ sleepy ; adverb : ↑ sleepily , ↑ sleeplessly ; verb : ↑ sleep ]
1 . someone who sleeps in a particular way
light sleeper (=someone who wakes easily)
heavy sleeper (=someone who does not wake easily)
2 . someone who is asleep
3 .
British English a heavy piece of wood or ↑ concrete that supports a railway track SYN tie American English
4 .
a) a night train with carriages that have beds for passengers to sleep in
b) a ↑ sleeping car
c) American English a bed on a train for a passenger to sleep in
5 . especially American English a film, book etc which is successful, even though people did not expect it to be
6 . American English a piece of clothing for a baby that covers its whole body including its feet
7 . 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