throwing a person under a big, smelly city
bus is the perfect metaphor for the act of positioning
someone to be ground
up under the wheels of the ever rolling omnibus of society in your stead. The bus carries people. The people's weight is what crushes the victim. This
setting up of a patsy has an earlier, more agrarian
beginning in "throwing him to the wolves." Someone is going
down, it's not going
to be you, so you select a candidate to feed into the system.