The term STUNNED BY A GUN can be summarized by the crossword solution TASED, which is an acronym for 'Thomas A. Swift's Electric Rifle, ' a type of non-lethal weapon used to incapacitate a person with an electric shock. This weapon is often used by law enforcement and security personnel to subdue suspects or to control crowds. The term STUNNED BY A GUN is used to describe the feeling of being shocked by such a weapon.