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sump
WIKTIONARY
sump
Noun
  • A hollow or pit into which liquid drains, such as a cesspool, cesspit or sink.
  • The lowest part of a mineshaft into which water drains.
  • A completely flooded cave passage, sometimes passable by diving.
  • The crankcase or oil reservoir of an internal combustion engine. automotive
  • The pit at the lowest point in a circulating or drainage system (FM 55-501). nautical
  • An intentional depression around a drain or scupper that promotes drainage. construction
Verb
  • Of a cave passage, to end in a sump, or to fill completely with water on occasion. intransitive