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Noun sleeper has 8 senses
  1. sleeper, slumberer - a rester who is sleeping
    --1 is a kind of rester
    --1 has particulars:
     dreamer; Rip van Winkle; sleeping beauty; sleepwalker, somnambulist, noctambulist; snorer; somniloquist
    Derived form: verb sleep1
  2. sleeper - 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
    --2 is a kind of
    spy, undercover agent; saboteur, wrecker, diversionist; terrorist
    --2 is a member of sleeper nest
  3. sleeper - an unexpected achiever of success; "the winner was a true sleeper--no one expected him to get it"
    --3 is a kind of
    achiever, winner, success, succeeder
  4. tie, railroad tie, crosstie, sleeper - one of the cross braces that support the rails on a railway track; "the British call a railroad tie a sleeper"
    --4 is a kind of brace, bracing
    --4 is a part of railroad track, railroad, railway
  5. sleeping car, sleeper, wagon-lit - a passenger car that has berths for sleeping
    --5 is a kind of passenger car, coach, carriage
    --5 has parts: drawing room; roomette
    Derived form: verb sleep2
  6. sleeper - a piece of furniture that can be opened up into a bed
    --6 is a kind of
    furniture, piece of furniture, article of furniture
    Derived form: verb sleep2
  7. sleeper, sleeper goby - tropical fish that resembles a goby and rests quietly on the bottom in shallow water
    --7 is a kind of percoid fish, percoid, percoidean
    --7 is a member of Eleotridae, family Eleotridae
  8. sleeper - an unexpected hit; "that movie was the sleeper of the summer"
    --8 is a kind of
    hit, smash, smasher, strike, bang
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