Definition:
A "tipper lorry" (also known as a dump truck) is a large vehicle designed to carry heavy loads, like sand, gravel, or dirt. The special feature of a tipper lorry is that it can lift its back end to dump out its contents easily, without needing to unload it by hand. This is done using hydraulic systems, which lift the back of the lorry so the materials fall out due to gravity.
A tipper lorry is a specialized truck that makes transporting and unloading heavy materials easier and more efficient by using hydraulics to tip its load out.