Meaning of horseback

horse•back

Pronunciation: (hôrs'bak"), [key]
— n.
  1. the back of a horse.
  2. a low, natural ridge of sand or gravel; an esker. Cf. hogback.
—adv.
  1. on horseback: to ride horseback.
—adj.
  1. made or given in a casual or speculative way; approximate or offhand: a horseback estimate on the construction costs.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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