Sump n.
  1. Metal. A round pit of stone, lined with clay, for receiving the metal on its first fusion.
  2. The cistern or reservoir made at the lowest point of a mine, from which is pumped the water which accumulates there.
  3. A pond of water for salt works.
  4. A puddle or dirty pool. [Prov. Eng.]
  Sump fuse, a fuse used in blasting under water.
  Sump men Mining, the men who sink the sump in a mine.
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