Definitions
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noun 
  1. (countable) Someone who sleeps.
  2. (countable) A saboteur or terrorist who lives unobtrusively in a community until activated by a prearranged signal; may be part of a sleeper cell.
  3. (countable) A railroad sleeping car.
  4. (countable)(context, rail transport, UK) A horizontal wooden or concrete structural member that supports and ties together railway lines.
    1. Something that achieves unexpected success after an interval of time.
    2. (countable) A goby-like bottom-feeding freshwater fish of the family Odontobutidae. Also "sleeper goby."
    3. (clothing) A type of pajamas, pajama for a person, especially a child, that covers its whole body, including their feet.
    Aaron, Devin, Ryan H., Cody, Ryan O., Wade, Lisa and Laura looked so comfy in their sleepers.
    1. A structural beam in a floor running perpendicular to both the joist, joists beneath and floorboard, floorboards above.

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