1
2
British
: crankcase
3
[German Sumpf, literally, marsh, from Middle High German — more at swamp]
a
: the lowest part of a mine shaft into which water drains
b
: an excavation ahead of regular work in driving a mine tunnel or sinking a mine shaft
4
: something resembling a sump : sink sense 2
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Merriam-Webster unabridged
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