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Definitions of sleeper
  1. noun
    a rester who is sleeping

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    type of:
  2. noun
    one of the cross braces that support the rails on a railway track
    "the British call a railroad tie a sleeper"
  3. noun
    tropical fish that resembles a goby and rests quietly on the bottom in shallow water

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  4. noun
    a passenger car that has berths for sleeping

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  5. noun
    an unexpected achiever of success
    "the winner was a true sleeper--no one expected him to get it"
  6. noun
    an unexpected hit
    "that movie was the sleeper of the summer"
  7. noun
    a piece of furniture that can be opened up into a bed
  8. noun
    a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal
  9. noun
    pajamas with feet; worn by children
Examples of sleeper
  • "the British call a railroad tie a sleeper"
  • "the winner was a true sleeper--no one expected him to get it"
  • "that movie was the sleeper of the summer"
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