IPA: /ˈlʌmpər/
KK: /ˈlʌmpər/
A person who works with freight or cargo, often helping to load or unload trucks, or a scientist who groups similar species or categories together.
The lumper helped the driver unload the heavy boxes from the truck.
The word 'lumper' originates from the Middle English 'lumpe', meaning a lump or mass, and is related to the Old English 'lympa', meaning a lump or clump. It refers to a person who handles or moves large, heavy items, often in a casual or unskilled manner.
Think of someone moving 'lumps' or 'masses' of goods — that's why a 'lumper' is a person who handles heavy items.