Definition of sump in English:


Line breaks: sump
Pronunciation: /sʌmp


1A hollow or depression in which liquid collects, especially one in the floor of a mine or cave.
More example sentences
  • The firm also claimed that each skip had four drainage holes to allow waste liquid to drain into a sump.
  • All the leachate drains by gravity from the leachate collection layer to a sump, from which it is pumped out of the landfill for treatment and disposal.
  • Back then there were not many cave divers active in the Yorkshire Dales and most sumps were virtually unexplored.
1.1A cesspool.
More example sentences
  • If all houses and apartment complexes keep their water tanks and sumps clean and treated with chlorine frequently, mosquito breeding can be prevented to an extent.
  • ‘No power in our house also means we cannot pump water from the sumps to the tank,’ Mukund, a resident, complained.
  • A waste sump overflowed in September causing hundreds of gallons of contaminated water to pour into the Gullielands Burn which flows through the Chapelcross site.
2The base of an internal-combustion engine, which serves as a reservoir of oil for the lubrication system.
More example sentences
  • Older engines used a camshaft located in the sump near the crankshaft.
  • There is also a ladder frame assembly between the sump and crankcase.
  • They prevent the fuel/air mixture and exhaust in the combustion chamber from leaking into the sump during compression and combustion.


Middle English (in the sense 'marsh'): from Middle Dutch or Low German sump, or (in the mining sense) from German Sumpf; related to swamp.

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