A trailer truck is a truck or lorry that is made in two or more sections which are joined togetherby metal bars, so that the vehicle can turn more easily.
[US]regional note: in BRIT, usually use articulated lorry
trailer truck in British English
(ˈtreɪlə trʌk)
noun
automobiles, US
a truck or lorry that is made in two or more sections which are joined together by metal bars, so that the vehicle can turn more easily