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The Collaborative International Dictionary
On horseback

Horseback \Horse"back`\, n.

  1. The back of a horse.

  2. An extended ridge of sand, gravel, and boulders, 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.