1a dog of a sturdy smooth-haired breed with a large head and powerful protruding lower jaw, a flat wrinkled face, and a broad chest.
a person noted for courageous or stubborn tenacity: [as modifier]:the bulldog spirit
2 informal (at Oxford and Cambridge Universities) an official who assists the proctors, especially in disciplinary matters.
verb (bulldogs, bulldogging, bulldogged)
[with object]North American
wrestle (a steer) to the ground by holding its horns and twisting its neck:Cal was bulldogging a mean steer [no object]:I bulldogged and rode broncos (as noun bulldogging)cowboys compete in bulldogging and bareback riding
bulldog in other Oxford dictionaries
Definition of bulldog in the US English dictionary