dump: [14] Dump is probably of Scandinavian origin – Danish and Norwegian have the similar dumpe and dumpa, which mean ‘fall suddenly’ – although Dutch dompen ‘immerse, topple’ is another candidate that has been put forward. Either way, there does not seem to be any direct connection with the dumps [16], which was probably originally a metaphorical use of Dutch domp ‘haze’, in the sense ‘miasma of depression’. Nor has any relationship been established with the obsolete noun dump ‘lump’ [18], which appears to have close ties with dumpling [16] and dumpy [16], although whether as source or descendant (by backformation) is a debatable point. [dump etymology, dump origin, 英语词源]