Breadcrumb Home > Dictionary > Index S stiff-arm: Meaning and Definition of Find definitions for: stiff-arm Pronunciation: (stif'ärm"), [key] — v.t., n. straight-arm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. stiff stiffen ✖ Related Content Daily Word Quiz: restive Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language