English edit

 
President Reagan and Queen Elizabeth II on horseback at Windsor Castle, 1982

Etymology edit

From Middle English horsebacke, horsebak, horsbak, equivalent to horse +‎ back.

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Noun edit

horseback (countable and uncountable, plural horsebacks)

  1. (usually with on, upon, etc.) The back of a horse.
    They came on horseback across the plains.
  2. (countable) A ridge of sand, gravel, and boulders.

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Adverb edit

horseback (not comparable)

  1. On the back of a horse.
    He rode horseback into town.

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