A pit or large plastic bucket or barrel inside the home designed to collect groundwater from a perimeter drain system.
Merriam-Webster Online Dictionarysump (noun)
a pit or reservoir serving as a drain or receptacle for liquids as
a) - cesspool
b) a pit at the lowest point in a circulating or drainage system (as the oil-circulating system of an internal combustion engine)
c) chiefly British - oil pan
British - crankcase
German literally, marsh, from Middle High German
a) the lowest part of a mine shaft into which water drains
b) an excavation ahead of regular work in driving a mine tunnel or sinking a mine shaft
something resembling a sump - sink
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A sump (American English and some parts of Canada: oil pan) is a low space that collects often undesirable liquids such as water or chemicals. A sump can also be an infiltration basin used to manage surface runoff water and recharge underground aquifers. Sump can also refer to an area in a cave where an underground flow of water exits the cave into the earth.