Source : WordNet®

bulldog
     adj : stubbornly unyielding; "dogged persistence"; "dour
           determination"; "the most vocal and pertinacious of all
           the critics"; "a mind not gifted to discover truth but
           tenacious to hold it"- T.S.Eliot; "men tenacious of
           opinion" [syn: {dogged}, {dour}, {pertinacious}, {tenacious},
            {unyielding}]
     [also: {bulldogging}]

bulldog
     n : a sturdy thickset short-haired breed with a large head and
         strong undershot lower jaw; developed originally in
         England for bull baiting [syn: {English bulldog}]
     v 1: attack viciously and ferociously
     2: throw a steer by seizing the horns and twisting the neck, as
        in a rodeo
     [also: {bulldogging}]

bulldogging
     See {bulldog}