sleeper Meaning in the Cambridge English Dictionary
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Meaning of “sleeper” in the English Dictionary

"sleeper" in British English

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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 ​slightestnoisewakes 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 ​travellingovernight so I've ​reserved a sleeper. The 11.45 to Venice is a sleeper.

sleeper noun (BLOCK)

[C] UK (US railroad tie) one of the ​heavyhorizontalblocks that ​supports a ​railwaytrack

sleeper noun (RING)

[C] UK a ​smallgold or ​silverring that is ​worn in a piercedear (= 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 ​surprisinglysuccessful after a ​longperiod of not ​achieving anything [C] a spy who only ​becomesactive a ​longtime after being put in ​place by an ​organization or ​country

sleeper noun (CLOTHING)

[C] US (UK sleepsuit) a ​piece of ​clothing for a ​baby that ​covers the ​wholebody, ​wornespecially at ​night
(Definition of sleeper from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sleeper" in American English

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sleepernoun [C]

 us   /ˈsli·pər/
a ​sleepingperson: He is a very light sleeper (= he ​wakeseasily). A sleeper is also a ​person or thing that is unexpectedly ​successful: We ​almost gave up on this ​line of ​merchandise, but it's a ​real sleeper – it ​keepsselling.
(Definition of sleeper from the Cambridge Academic Content Dictionary © Cambridge University Press)

"sleeper" in Business English

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sleepernoun [C]

uk   us   /ˈsliːpər/ (also sleeper hit) MARKETING
a ​product, film, ​book, etc. that becomes a sudden ​success, after a ​period of not being ​successful at all: The movie ​cost only $400,000 to make, and then ​blew up into a $39 million sleeper. Her ​book has been the ​big sleeper ​hit of the literary scene.
(Definition of sleeper from the Cambridge Business English Dictionary © Cambridge University Press)
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