Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: sump 'swamp' (15-20 centuries), from Middle Dutch somp or Middle Low German sump 'wet ground'

sump

noun
     
sump [countable]
1TECDH the lowest part of a drainage system, where liquids or wastes remain
2 British EnglishTTCTEM the part of an engine that contains the supply of oil [= oil pan American English]

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