horseback

[hawrs-bak]
noun
1.
the back of a horse.
2.
Geology. a low, natural ridge of sand or gravel; an esker. Compare hogback.
adverb
3.
on horseback: to ride horseback.
adjective
4.
made or given in a casual or speculative way; approximate or offhand: a horseback estimate on the construction costs.

Origin:
1350–1400; Middle English. See horse, back1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
horseback (ˈhɔːsˌbæk)
 
n
a.  a horse's back (esp in the phrase on horseback)
 b.  (as modifier): horseback riding

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
People crossed the riverbed on foot, on horseback and in horse-drawn buggies.
Mongols spent so much time on horseback that they grew up bowlegged.
Jumping over a fence on horseback is an almost utterly counterintuitive process.
He often checks his cows on horseback, but that day his steed was a
  mud-splattered all-terrain vehicle.
Images for horseback
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