bulldog
1. bull.dog \'bu.l-.do.g\ n 1: a compact muscular short-haired dog of an English breed marked by vigor and sagacity with forelegs set widely apart and an undershot lower jaw 2: a revolver of large caliber and short barrel 3: a proctor's attendant at an English university 2. bulldog aj : resembling a bulldog 3. bulldog vt : to throw (a steer) by seizing the horns and twisting the neck