Tail means the end of a shot. The usage ‘tail’ is also employed in tail slate, meaning that the mark on a shot occurs at the end of the shot as opposed to the beginning.
We are going to give you a special treat on this blog. When I travel around the world, many people come up and ask me about the one shot helicopter crash in Terminator:Salvation. So I thought this was a fitting place to talk about all in one shot sequences...