1. A large cargo-carrying trailer without a front axle, designed to be towed by a semi-truck (tractor unit), with the rear portion supported by the towing vehicle
The semi-trailer was loaded with goods for cross-country transport.
O semirreboque foi carregado com mercadorias para transporte transcontinental.
2. The combination of a tractor unit and cargo trailer used for heavy freight transportation
A semi-trailer pulled onto the highway carrying automotive parts.
Um semirreboque entrou na rodovia carregando peças automotivas.