/ Dictionary / Index U undergird: Meaning and Definition of Find definitions for: un•der•gird Pronunciation: (un"dur-gûrd'), [key] — -gird•ed -girt, -gird•ing. to strengthen; secure, as by passing a rope or chain under and around: to undergird a top-heavy load. to give fundamental support; provide with a sound or secure basis: ethics undergirded by faith. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undergird (Thesaurus) undergarment underglaze 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