sump /sʌmp/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: sump 'swamp' (15-20 centuries) , from Middle Dutch somp or Middle Low German sump 'wet ground' ]
1 . the lowest part of a ↑ drainage system, where liquids or wastes remain
2 . British English the part of an engine that contains the supply of oil SYN oil pan American English