Fan 返 means go back. Anqiao 鞍鞽 means saddle. “Qiao 鞽” can also be written as “qiao 橋”, the Chinese character meaning ”bridge“, because the arched shape of a saddle looks like a bridge. This is a use of metonymy, using a riding gear on the horse to represent the whole horse. Therefore, the term literally means ”go back by horse”.