Definitions

1. noun

A depression or pit in the ground, especially one that holds water.

“The sump in the field had become a breeding ground for mosquitoes.”

2. noun

A container or reservoir that holds oil or other liquid in a vehicle, especially in the engine.

“The mechanic checked the sump to see if it needed to be changed.”

3. verb

To sink or settle into a depression or pit, especially in a soft or muddy surface.

“The car sumped into the mud and got stuck.”