trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi
['safe', 'punching bag, punch bag, punching ball, punchball', 'freight car', 'breastplate, aegis, egis', 'mountain bike, all-terrain bike, off-roader', 'breakwater, groin, groyne, mole, bulwark, seawall, jetty', 'loudspeaker, speaker, speaker unit, loudspeaker system, speaker system']