Webster's English Dictionary

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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