The compound "tow-truck" is a transparent description of the vehicle's function, formed in the 20th century with the rise of motor transport. The first element, "tow," originates from the Old English verb togian, meaning to drag or pull, a concept central to the vehicle's purpose. The second element, "truck," derives from the Latin trochus (wheel), which entered English via French and originally denoted a wheeled vehicle for heavy loads. The logic of the word is straightforward: it is a truck specifically designed for the action of towing, directly linking its physical form to its primary utility in roadside assistance and vehicle recovery.

Structure: tow (to pull) + truck (vehicle) - tow: From Old English togian (to drag, pull), of Germanic origin. Functional role: Verb root describing the core action. - truck: From Latin trochus (iron hoop, wheel), via Greek trokhos (wheel, course). Functional role: Noun root identifying the type of vehicle.