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  Dictionary Definition of sump

sump
noun
1. a pit, well, or the like in which water or other liquid is collected.
2. Machinery a container situated at the lowest point in a circulating system, especially the crankcase of an internal-combustion engine, which acts as an oil reservoir.
3. Mining a. a space at the bottom of a shaft or below a passageway where water is allowed to collect. b. a pilot shaft or tunnel pushed out in front of a main bore.
[ME sompe, muddy pool, bog, from MLG or MD sump, c. G Sumpf ]