Definition of bobtail noun from the Oxford Advanced Learner's Dictionary

     

    bobtail

     noun
    noun
    BrE BrE//ˈbɒbteɪl//
     
    ; NAmE NAmE//ˈbɑːbteɪl//
     
     
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  1. 1a dog, cat or horse with a tail that has been cut short
  2. 2a tail that has been cut short
  3. Word Origin mid 16th cent.: probably from bob ‘ the short hairstyle’ + tail. It was originally recorded as a humorous term for a kind of broad-headed arrow, probably because it looked as though it had been cut short.
See the Oxford Advanced American Dictionary entry: bobtail