To buy a very popular game on the release day, I went to a store before they opened, but there was already a line from the store that was about 200-meters long to the end.
I saw Kristen at the end of a line for a shop I passed by yesterday. I wonder what she was playing hooky from work to get.
The end of the line is this way.
You already know that 最後 means "end" so the tail end is the end of a line.
This is a jukugo word that uses the on'yomi readings of the kanji. It isn't the same as 最後 though, so watch out for that! It uses the other on'yomi reading you learned with the kanji!