A tractor-trailer or big rig, consisting of a semi-trailer and a semitruck pulling it; in American English referred to as semi-trailer truck or 18-wheeler.
A large, cumbersome truck or lorry, especially an artic.
An institution that incites destructive devotion or to which people are carelessly sacrificed.
A literal or metaphorical force or object regarded as unstoppable, that will crush all in its path.