lumper UK /ˈlʌmpə/US /ˈlʌmpɚ/noun 5verb 1forms 3 noun5 •A scientist in one of various fields who prefers to keep categories such as species or dialects together in larger groups. •An extra laborer hired to assist in the loading or unloading of a truck or a ship. •(dialect) A militiaman. •(dialect) A lamprey. •(historical) Synonym of lumpman (“type of salt worker”). verb1 •(no longer used) To lumber; to plod.Over piggeries, and mixens, and apples, and hay, / They lumpered straight into the night; / And finding bylong where a halter-path lay, / At dawn reached Tim's house […] — 1866 formslumpered · lumpering · lumpers