Entry 2 senses · 2 variants Webster, 1913 Bobtail · Bob·tail · IPA /ˈbɑbteɪl/ n. a. 01 n. An animal (as a horse or dog) with a short tail. 1. An animal (as a horse or dog) with a short tail. Phrases & compounds Rag, tag, and bobtail — the rabble. 02 a. Bobtailed. 1. Bobtailed.