bulldog: Meaning and Definition of

bull•dog

1. 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. a stubbornly persistent person.
3. a short-barreled revolver of large caliber.
4. slag from a puddling furnace.
5. an assistant to the proctor at Oxford and Cambridge universities.

1. like or characteristic of a bulldog or of a bulldog's jaws: bulldog obstinacy.

1. to attack in the manner of a bulldog.
2. to throw (a calf, steer, etc.) to the ground by seizing the horns and twisting the head.