[{"Bold_text": "verb (used without object)", "List Items": ["to draw back; start or shrink back, as in alarm, horror, or disgust.Synonyms: falter , flinch , quail , withdraw", "to spring or fly back, as in consequence of force of impact or the force of the discharge, as a firearm.Synonyms: rebound", "to spring or come back; react (usually followed byonorupon):Plots frequently recoil upon the plotters.", "Physics.(of an atom, a nucleus, or a particle) to undergo a change in momentum as a result either of a collision with an atom, a nucleus, or a particle or of the emission of a particle."]}, {"Bold_text": "noun", "List Items": ["an act of recoiling.", "the distance through which a weapon moves backward after discharging."]}]