A vehicle, especially a truck, designed to automatically dump or unload its contents by tilting its cargo bed backward or to the side.
From 'dump' + the agent suffix '-er'. First used in the early 20th century to describe trucks that could mechanically unload rather than requiring manual labor.
The invention of dump trucks with hydraulic systems in the 1920s transformed construction and mining, turning what was backbreaking manual labor into a mechanical process that one person could operate from a cabin.
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