Sump

Sump

(1):

(n.) The cistern or reservoir made at the lowest point of a mine, from which is pumped the water which accumulates there.

(2):

(n.) A pond of water for salt works.

(3):

(n.) A puddle or dirty pool.

(4):

(n.) A round pit of stone, lined with clay, for receiving the metal on its first fusion.