The story
Deverbal from roll off.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Able to be rolled off (and later, rolled back onto) the bed of a flatbed truck (flatbed lorry) in a motorized way, using a winch and cable. Full definition →
Deverbal from roll off.
Etymology from Wiktionary, CC BY-SA 4.0.