side arm

(noun) a firearm that is held and fired with one hand. Synonyms: pistol, handgun, shooting iron.

(adj) (of pitches) made with the arm moving parallel to the ground. Synonyms: sidearm. Example: "A sidearm pitch."

(adv) in a sidearm manner. Synonyms: sidearm. Example: "He prefers to throw sidearm."