sump \sump\, n. cf. g. sumpf a sump in a mine, a swamp, akin to
   lg. sump, d. somp a swamp, dan.  sw. sump, and perhaps to e.
   swamp.
   1. metal. a round pit of stone, lined with clay, for
      receiving the metal on its first fusion. --ray.
      1913 webster

   2. the cistern or reservoir made at the lowest point of a
      mine, from which is pumped the water which accumulates
      there.
      1913 webster

   3. a pond of water for salt works. --knight.
      1913 webster

   4. a puddle or dirty pool. prov. eng.
      1913 webster

   sump fuse, a fuse used in blasting under water.

   sump men mining, the men who sink the sump in a mine.
      1913 webster
see also:
sump fuse sump men