sump pump

a pump for removing liquid or wastes from a sump.

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica

sump pump

device that removes accumulations of water or other liquids from a sump pit, the lowest point in a drainage system. If the sump pit is wet only intermittently (e.g., the basement sump of a house), a self-priming pump is used, generally one equipped with a mechanism to start it automatically as needed. If the sump is always wet (e.g., the oil sump in an automobile engine or the water sump in a mine), a non-self-priming pump may be allowed to run continuously

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Utilities are to remain off unless required to operate a sump pump.
Located the sump pump remote high water alarm system.
Homeowners can visit a display featuring a sump pump, backflow valve and floor drain plug, and pickup free publications.
Water operated sump pumps are installed to work when the electric sump pump fails.
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