1. The back of a horse.
2. An extended ridge of sand, gravel, and boulders, in a half-stratified condition.
On horseback, on the back of a horse; mounted or riding on a horse or horses; in the saddle.
The long journey was to be performed on horseback. --Prescott.
n 1: the back of a horse
2: a narrow ridge of hills [syn: hogback]
adv : on the back of a horse; "he rode horseback to town";
"managed to escape ahorse"; "policeman patrolled the
streets ahorseback" [syn: ahorse, ahorseback]