Breadcrumb Home > Dictionary > Index B beef-up: Meaning and Definition of Find definitions for: beef-up Pronunciation: (bēf'up"), [key] — n. an act or instance of strengthening or reinforcing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: beef-up (Thesaurus) beef tea beef Wellington ✖ Related Content Daily Word Quiz: donnybrook Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language