/ Dictionary / Index U underframe: Meaning and Definition of Find definitions for: un•der•frame Pronunciation: (un'dur-frām"), [key] — n. the lower frame on which a vehicular structure rests: the underframe of a bus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underframe (Thesaurus) underfoot underfur Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language