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Definition of: sump
(sump) noun
1. Mining a A depression sunk below the lowest level in a mine shaft, to receive water and form a pool from which it may be pumped, b A sump winze.
2. Mech. The lowest part of the crankcase of an internal-combustion engine, acting as a reservoir for lubricating oil.
3. A cesspool or other reservoir for drainage. [<MDu. somp, sump a marsh. Akin to SWAMP.]
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