The compound "stun-gun" is a modern, transparent formation from two English words. "Stun" originates from a Germanic root meaning to daze or make a loud noise, evolving to signify rendering someone unconscious or senseless. "Gun" has a more colorful history, emerging in the 14th century as a term for a ballistic weapon, possibly from a personal name applied to early artillery. Combined in the late 20th century, the term logically and literally describes a "gun" whose primary purpose is to "stun" its target, typically through electrical means, rather than to cause lethal harm.

Structure: stun (verb) + gun (noun) - stun: From Middle English stonen, stunen (to be dazed, to be stunned), of Germanic origin. Functions as the descriptive verb element, indicating the weapon's effect. - gun: From Middle English gunne, gonne, likely a shortened form of the Scandinavian woman's name Gunnhildr, used in early cannon names. Functions as the noun element, classifying the object as a weapon.