Drivers and mechanics use this term to refer to a Class 8 heavy-duty truck. While it originally described the specific combination of a prime mover and its attached trailer, it now commonly refers to the tractor itself. The term implies a large, specialized vehicle rather than a standard pickup or box truck.
Heard on the job
Park the rig in bay four so we can check those air lines.
Also heard as
- big rig
- tractor
- semi