The posterior part of an animal, especially when elongated and extending beyond the trunk or main part of the body, The rear end of an automobile or other vehicle, A long thin arrangement, part, or structure, often extending from a main structure, adjective_ Being in tail, Of or relating to a tail or tails, Situated in the tail, as of an airplane, intransitive verb_ To provide with a tail, To serve as the tail or last part of, To become lengthened or spaced when moving in a line