sump
noun
1. an oil reservoir in an internal combustion engine
Definition categories: man–made, reservoir
2. a well or other hole in which water has collected
Definition categories: man–made, well
3. a covered cistern; waste water and sewage flow into it
Similar word(s): cesspit, cesspool, sink
Definition categories: man–made, cistern
verb
1. (transitive) Of a cave passage, to end in a sump, or to fill completely with water on occasion.