(intransitive) Of a cave passage, to end in a sump, or to fill completely with water on occasion.

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.

simple past tense and past participle of sump

present participle of sump

plural of sump

Third-person singular simple present indicative form of sump

(automotive) A type of engine sump where oil that flows down from the crankshaft etc is sucked up into an external reservoir (as opposed to a wet sump where it simply pools in a pan at the bottom of the engine).

(chiefly US) A hole dug in the ground, beneath the basement of a house, in which rainwater etc collects.

a pump used for the removal of liquid from a sump or sump pit

Misspelling of sum up.