The term 'BIG TRUCK, FOR SHORT' can be summarized as 'SEMI', which is a four-letter word. A SEMI-truck, also known as an articulated lorry, is a large truck used for transporting goods over long distances. It consists of two parts: the tractor and the trailer. The tractor is the front part of the truck, while the trailer is the back part. SEMI-trucks are commonly used in the transportation industry due to their size and capacity.