Cars & Driving
- noun a metal bowl (usually of sheet steel or cast alloy) attached to the bottom of the crankcase, into which oil drains to form a reservoir; typically carries one gallon of motor oil
- A pit, tank, or basin that receives sewage, liquid waste, seepage, or overflow water and is located below the normal grade of the disposal system. A sump must be emptied by mechanical means.
- A depression in a roof deck at a drain.