Meaning

noun an oil reservoir in an internal combustion engine

noun a well or other hole in which water has collected

noun a covered cistern; waste water and sewage flow into it

originFrom Middle English sompe, either from Middle Dutch somp, sump or Middle Low German sump from Old Saxon *sump, from Proto-West Germanic *sump, ultimately from Proto-Germanic *sumpaz. Doublet of swamp.

Etymology from Wiktionary, CC BY-SA 3.0