tail end
1. The rear or hindmost part of a person or animal; the place where an animal's tail is or would be. The fish can be identified by the distinctive purple stripes on its tail end. I fell off the horse and landed right on my tail end.
2. The very final stretch, part, or period of something. I'm getting to the tail end of the book Carol got me for Christmas. The singer just walked off the stage at the tail end of the concert without saying a word.