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ahorse - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

From a- +‎ horse.

ahorse (not comparable)

  1. (archaic) On the back of a horse; on horseback.

    He managed to escape ahorse.

    • 1817, Maria Edgworth, Ormond, Chapter 4, in Harrington, and Ormond, Tales, London: R. Hunter, Volume 2, p. 85,[1]
      “By all that’s princely,” cried he, “then, that young Harry Ormond was intended for a prince, he sits a horse so like myself; and that horse requires a master hand to manage him.”
    • 1960, Poul Anderson, chapter 2, in The Golden Slave,‎[3], New York: Avon:

      Two Romans ahorse were circling about four dismounted Cimbri, who stood back to back and glared.