sump

[suhmp]
noun
1.
a pit, well, or the like in which water or other liquid is collected.
2.
Machinery. 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.
British, crankcase.
5.
British Dialect. a swamp, bog, or muddy pool.

Origin:
1375–1425; late Middle English sompe < Middle Low German or Middle Dutch sump; cognate with German Sumpf; akin to swamp

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sump (sʌmp)
 
n
1.  a receptacle, such as the lower part of the crankcase of an internal-combustion engine, into which liquids, esp lubricants, can drain to form a reservoir
2.  another name for cesspool
3.  mining
 a.  a depression at the bottom of a shaft where water collects before it is pumped away
 b.  the front portion of a shaft or tunnel, ahead of the main bore
4.  dialect (Brit) a muddy pool or swamp
 
[C17: from Middle Dutch somp marsh; see swamp]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

sump
early 15c., "marsh, morass," from M.Du. somp or M.L.G. sump, from P.Gmc. *sumpaz. Meaning "pit to collect water" is first found 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for sumps
Lives were lost by falling into sumps of this water hot from the vein.
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