bull·dog / ˈboŏlˌdôg/ • n. a 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 adj.] the bulldog spirit. • v. (-dogged, -dog·ging) [tr.] wrestle (a steer) to the ground by holding its horns and twisting its neck: [as n.] (bulldogging) cowboys compete in bulldogging and bareback riding. DERIVATIVES: bull·dog·ger n.
At Oxford and Cambridge Universities, bulldog is used informally for an official who assists the proctors, especially in disciplinary matters.
Bulldog Drummond the hero of a series of novels by Sapper ( H. C. McNeile, 1888–1937); the former Captain Drummond is a large, ugly, xenophobic, but charming ex-army officer who despite his apparent brainlessness defeats a succession of fiendishly clever international crooks with a blend of violence and daring.