sleeper Definition in Cambridge British English Dictionary
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Definition of "sleeper" - British English Dictionary

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sleepernoun

uk   /ˈsliː.pər/  us   /-pɚ/

sleeper noun (PERSON)

a good/heavy/light sleeper someone who sleeps in the stated way: I'm a light sleeper - the slightest noise wakes me. You won't wake him - he's such a heavy sleeper.

sleeper noun (ON TRAIN)

acarriage in a train with beds for passengers to sleep in, or one of the beds in this carriage, or the type of train that has these carriages: I'm travelling overnight so I've booked a sleeper. The 11.45 to Venice is a sleeper.

sleeper noun (BLOCK)

[C] UK (US railroad tie) one of the heavy horizontal blocks that supports a railway track

sleeper noun (RING)

[C] UK a small gold or silver ring that is worn in a pierced ear (= one that has a hole in it) to stop the hole from closing while other earrings are not being worn

sleeper noun (SUDDEN ACTIVITY)

[C] a person or thing that is suddenly and surprisingly successful after a long period of not achieving anything [C] a spy who only becomes active a long time after being put in place by an organization or country
(Definition of sleeper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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