sleeper (n.)

  1. a rester who is sleeping

    [ Syn: slumberer ]

  2. 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

  3. an unexpected achiever of success; the winner was a true sleeper--no one expected him to get it'

  4. one of the cross braces that support the rails on a railway track; the British call a railroad tie a sleeper

    [ Syn: tie , railroad tie , crosstie ]

  5. a passenger car that has berths for sleeping

    [ Syn: sleeping car , wagon-lit ]

  6. pajamas with feet; worn by children

  7. a piece of furniture that can be opened up into a bed

  8. tropical fish that resembles a goby and rests quietly on the bottom in shallow water

    [ Syn: sleeper goby ]

  9. an unexpected hit; that movie was the sleeper of the summer'

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.