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Definition of sleeper noun from the Oxford Advanced American Dictionary

     

    sleeper

     noun
    noun
    NAmE//ˈslipər//
     
     
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  1. 1(used with an adjective) a person who sleeps in a particular way a heavy/light/sound sleeper
  2. 2a person who is asleep Only the snores of the sleepers broke the silence of the house.
  3. 3a night train with beds for passengers on it the Washington, D.C. to Los Angeles sleeper I came up last night on the sleeper.
  4. 4= sleeping car
  5. 5(informal) a movie, play, or book that for a long time is not very successful and then is suddenly a success
  6. 6(also sleeper agent) a spy who is sent to live in a country as a normal citizen and is not used until much later The sleeper had lived in the U.S. for two decades. He infiltrated a terrorist sleeper cell.
See the Oxford Advanced Learner's Dictionary entry: sleeper

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