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n. - An unexpected hit; Tropical fish that resembles a goby and rests quietly on the bottom in shallow water; A piece of furniture that can be opened up into a bed; Pajamas with feet; A passenger car that has berths for resting;

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Usage examples (42)
  • 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
  • The term sleeper has simply taken on a new meaning and sleepers themselves are a bit harder to find.
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The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.