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sleeper

noun (ON TRAIN)
 
 
/ˈsliː.pər/ US  /-pɚ/

Definition

a carriage 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 Glasgow is a sleeper.Trains and parts of trains
(Definition of sleeper noun (ON TRAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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