Definition of 'sleeper'

Noun

1. a rester who is sleeping
      Synonyms: 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"
      Synonyms: tie railroad tie crosstie
5. a passenger car that has berths for sleeping
      Synonyms: 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
      Synonyms: sleeper goby
9. an unexpected hit; "that movie was the sleeper of the summer"

---

Get this dictionary without ads as part of the e-Tutor Virtual Learning Program.