HORSEBACK

horseback. Horseback, n. the seat or state of riding a horse

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Horse″back′ (?), n. 1. 1. The back of a horse.
2. 2. An extended ridge of sand, gravel, and bowlders, in a half-stratified condition. Agassiz.
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.