Bus terminology
Swing-axle
EN · source definition
A type of rear axle that is 'fixed' at the wheel (that is, it is not able to flex up or down), but is able to move up and down at the transmission end. It required the rear wheels to move in an arc, rather than vertically, when hitting bumps. in some cars (beetles and corvairs and some early porsches), it could cause the wheel to tuck under the car during high speed cornering.
Attributed to vanagon_archiveView source
Canonical entry: dictionary.ja1.io/en/swing-axle