sleeper /ˈsliːpɚ/ noun
plural sleepers
plural sleepers
Learner's definition of SLEEPER
: a person who sleeps in a particular way
: someone who is asleep
: a place or piece of furniture that can be used for sleeping usually used before another noun
: 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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