/ Dictionary / Index S side arm: Meaning and Definition of Find definitions for: side' arm" Pronunciation: [key] — Mil. Mil. a weapon, as a pistol or sword, carried at the side or in the belt. side•arm Pronunciation: (sīd'ärm"), [key] — adv. with a swinging motion of the arm moving to the side of the body at shoulder level or below and nearly parallel to the ground: to pitch sidearm. —adj. thrown or performed sidearm: a sidearm curve ball; sidearm stroke. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sidearm (Thesaurus) side side band Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language