semi-trailer, (USA, Canada) semi, (UK) artic trailer (a trailer without front axle and with wheels only at the trailing end, designed to be pulled via a pivoting arrangement which also partially supports its weight.); (USA, Canada) semi-truck, 18-wheeler, eighteen-wheeler, semi-trailer truck, tractor-trailer, semi, big rig ; (UK) articulated lorry, artic, HGV, LGV, juggernaut, jugger (a semi-trailer plus the truck or tractor pulling it); trailer (vehicle); trailer (preview)
defector, turncoat, traitor (someone leaves their country, political party, or other group, and joins an opposing country, party, or group); deserter; fugitive