[{"Bold_text": "noun", "List Items": ["one of an English breed of medium-sized, short-haired, muscular dogs prominent, undershot jaws, usually having a white and tan or brindled coat, raised originally for bullbaiting.", "Informal.a stubbornly persistent person.", "a short-barreled revolver of large caliber.", "Metallurgy.slag from a puddling furnace.", "an assistant to the proctor at Oxford and Cambridge universities."]}, {"Bold_text": "adjective", "List Items": ["like or characteristic of a bulldog or of a bulldog's jaws:bulldog obstinacy."]}, {"Bold_text": "verb (used with object)", "List Items": ["to attack in the manner of a bulldog.", "Western U.S.to throw (a calf, steer, etc.) to the ground by seizing the horns and twisting the head."]}]