bull·dog /ˈbʊlˌdɔg ||ˈbʌl-/
 牛頭犬;頑固的人


 Bull·dog n.
 1. Zool. A variety of dog, of remarkable ferocity, courage, and tenacity of grip; -- so named, probably, from being formerly employed in baiting bulls.
 2. Metal. A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill.


 Bull·dog, a. Characteristic of, or like, a bulldog; stubborn; as, bulldog courage; bulldog tenacity.
 Bulldog bat Zo'94l., a bat of the genus Nyctinomus; -- so called from the shape of its face.

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 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]
      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]