sleeper

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sleep·er / ˈslēpər/ • n. 1. a person or animal who is asleep. ∎  a person with a specified sleep pattern: he was a light sleeper. 2. a thing used for or connected with sleeping, in particular: ∎  a train carrying sleeping cars. ∎  a sleeping car. ∎  a berth in a sleeping car. ∎  (often sleepers) one-piece coverall pajamas for a baby or small child. ∎  a sofa or chair that converts into a bed. 3. a movie, book, play, etc., that achieves sudden unexpected success. 4. Brit. a railroad tie. 5. a stocky fish (Dormitator and other genera, family Gobiidae (or Eleotridae)) with mottled coloration that occurs widely in warm seas and fresh water.

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