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Meaning of sumps

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.
The pit at the lowest point in a circulating or drainage system (FM 55-501).

verb

Of a cave passage, to end in a sump, or to fill completely with water on occasion. Example: This low passage sumps quickly after moderate rainfall.

Source: Free Dictionary API.

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