American English

Definition of sleeper noun from the Oxford Advanced American Dictionary



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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. 3 a 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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