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sump (n.)

mid-15c., "marsh, morass" (from mid-13c. in place names), from Middle Dutch somp or Middle Low German sump, from Proto-Germanic *sumpaz, from PIE *swombho- "spongy." Meaning "pit to collect water" is first found 1650s. Sump-pump (1884) originally was in mining.

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Definitions of sump from WordNet

sump (n.)
an oil reservoir in an internal combustion engine;
sump (n.)
a well or other hole in which water has collected;
sump (n.)
a covered cistern; waste water and sewage flow into it;
Synonyms: cesspool / cesspit / sink
From wordnet.princeton.edu