Pronunciation: (sump), [key]
1. a pit, well, or the like in which water or other liquid is collected.
2. Mach.a chamber at the bottom of a machine, pump, circulation system, etc., into which a fluid drains before recirculation or in which wastes gather before disposal.
3. Mining.
a. a space where water is allowed to collect at the bottom of a shaft or below a passageway.
b. a pilot shaft or tunnel pushed out in front of a main bore.
4. Brit.crankcase.
5. Brit. Dial.a swamp, bog, or muddy pool.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

sumosump pump
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