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Noun sump has 3 senses
  1. sump - an oil reservoir in an internal combustion engine
    --1 is a kind of     reservoir
  2. sump - a well or other hole in which water has collected
    --2 is a kind of     well
  3. cesspool, cesspit, sink, sump - a covered cistern; waste water and sewage flow into it
    --3 is a kind of cistern
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