underframe

[ uhn-der-freym ]

noun

1. the lower frame on which a vehicular structure rests:

   the underframe of a bus.

Word History and Origins

Origin of underframe¹

First recorded in 1850–55; under- + frame

Example Sentences

Its place was then supplied by other and better vehicles,—though they were no other than old stage-coach bodies purchased by the company, and each mounted upon an underframe with flange-wheels. 

From Project Gutenberg

M, is of the internal pole type, and is supported on the underframe of the wagon.

From Project Gutenberg

The underframe is provided with spring axle boxes, and also with spring buffers and drawbars.

From Project Gutenberg

For gages of 20 inches and upward the motors can be mounted on springs and attached to the running axles inside of the wagon underframe.

From Project Gutenberg