A big rig truck: a semi-trailer plus the truck or tractor pulling it.
The tractor unit of a semi-truck without a trailer
A short, or deliberately shortened tail.
A tractor which performs without its trailer.
A tractor-trailer that is relatively short in length.
An animal that has a bobtail, such as certain canines or nags.
An open-ended straight or four flush.
To drive a tractor without its trailer.
To drive a truck or other vehicle without its trailer.