The hindmost part of an animal, especially when prolonged beyond the rest of the body, such as the flexible extension of the backbone in a vertebrate, the feathers at the hind end of a bird, or a terminal appendage in an insect. The end of a long train or line of people or vehicles. A person's buttocks. The reverse side of a coin (used when tossing a coin). Limitation of ownership, especially of an estate or title limited to a person and their heirs. Follow and observe (someone) closely, especially in secret. (of an object in flight) drift or curve in a particular direction. Provide with a tail. Join (one thing) to another.