发疯fā∥fēng 1.精神受到刺激而发生精神病的症状。{go mad; suffer from a disease of the brain or disorder of the mind because of traumatic experience} 2.〈比喻fig.〉做事出于常情之外{lose one's head or mind}: 你～啦,这么大热天,还穿棉袄!{You're crazy to wear a cotton-padded jacket on such a hot day!}