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sleeper

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sleeper/ˈsliːpɚ/noun
pluralsleepers
sleeper
/ˈsliːpɚ/
noun
pluralsleepers
Learner's definition of SLEEPER  
[count]
: a person who sleeps in a particular way
   b  : someone who is asleep
: a place or piece of furniture that can be used for sleeping — usually used before another noun
   b  : sleeping car
chiefly US, informal  : someone or something that suddenly becomes successful in a way that was not expected
: a spy who lives and works for a long time like an ordinary person among the people he or she is spying on — often used before another noun
US  : a piece of clothing that covers the entire body including usually the feet and that is worn by a baby or small child
British  : one of the heavy beams to which the rails of a railway are attached : tie
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