bobtail" refers to a term commonly used in the transportation industry to describe a truck or tractor operating without a trailer attached. It refers to the practice of a truck making a delivery or completing a trip without hauling a full load or a specific trailer. The term "bobtail" is often used to describe the truck's condition when it is not connected to a trailer and is commonly seen in scenarios such as intermodal drayage, when a truck moves containers between different points within a port or terminal.