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.

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.

like or characteristic of a bulldog or of a bulldog's jaws

bulldog obstinacy.

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.