鞍上人なく鞍下馬なし
Meanings
1
riding so skillfully that man and horse become one
Idiomatic expression describing a rider so accomplished that the distinction between rider and horse disappears. Often used in martial arts, horsemanship, or metaphorically for any masterful unity of person and tool.
His riding truly reaches the state where man and horse are one.
A martial arts master wields a weapon as if rider and horse were one.