sump /sʌmp/noun 7verb 1forms 3 noun7 •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. •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). •An intentional depression around a drain or scupper that promotes drainage. •A completely flooded cave passage, sometimes passable by diving. •(Scotland) A sudden or heavy fall of rain; a deluge."Me and the lads did it this morn." "It was pouring!" Brody said. "If I was tae stop an activity because of a sump o' rain, I'd never get anythin' done," Finn remarked with a twinkle in his eye. — 2024 verb1 •Of a cave passage, to end in a sump, or to fill completely with water on occasion.We discovered a new passage, but it sumped after 100 metres.This low passage sumps quickly after moderate rainfall. formssumped · sumping · sumps
