one of an English breed of medium-sized, short-haired, muscular dogs with prominent, undershot jaws, usually having a white and tan or brindled coat, raised originally for bullbaiting.
2.
Informal.a stubbornly persistent person.
3.
a short-barreled revolver of large caliber.
4.
Metallurgy. slag from a puddling furnace.
5.
an assistant to the proctor at Oxford and Cambridge universities.