Scup·per n.  Naut. An opening cut through the waterway and bulwarks of a ship, so that water falling on deck may flow overboard; -- called also scupper hole.
  Scupper hose Naut., a pipe of leather, canvas, etc., attached to the mouth of the scuppers, on the outside of a vessel, to prevent the water from entering. --Totten.
  Scupper nail Naut., a nail with a very broad head, for securing the edge of the hose to the scupper.
  Scupper plug Naut., a plug to stop a scupper. --Totten.
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