• synonyms


  1. the lower frame on which a vehicular structure rests: the underframe of a bus.
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Origin of underframe

First recorded in 1850–55; under- + frame
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for underframe

Historical Examples

  • On this underframe the superstructure or frame is erected to form the body of the car.

    The Story of the Pullman Car

    Joseph Husband

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

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