1. An oil reservoir in an internal combustion engine
   "The mechanic checked the sump for any signs of oil leakage"
    
2. A well or other hole in which water has collected
   "The basement had a sump to prevent flooding during heavy rains"
    
3. A covered cistern; waste water and sewage flow into it
   "The old house still relied on a sump for waste management";
   - cesspool, cesspit, sink

Derived forms: sumps

Type of: cistern, reservoir, well

Encyclopedia: Sump