Definitions of sleeper:
  • noun:   an unexpected hit
    Example: "That movie was the sleeper of the summer"
  • noun:   tropical fish that resembles a goby and rests quietly on the bottom in shallow water
  • noun:   a piece of furniture that can be opened up into a bed
  • noun:   a rester who is sleeping
  • noun:   an unexpected achiever of success
    Example: "The winner was a true sleeper--no one expected him to get it"
  • 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
  • noun:   a passenger car that has berths for sleeping
  • noun:   one of the cross braces that support the rails on a railway track
    Example: "The British call a railroad tie a sleeper"
  • name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #9631)

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Book See sleeper used in context: 104+ rhymes, 1 Shakespeare work, several books and articles.

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