Etymology
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horseback (n.)

"the back of a horse," especially the part upon which a rider sits, late 14c., from horse (n.) + back (n.). The alternative formerly was described in jest as footback [Century Dictionary].

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Definitions of horseback
1
horseback (n.)
the back of a horse;
horseback (n.)
a narrow ridge of hills;
Synonyms: hogback
2
horseback (adv.)
on the back of a horse;
he rode horseback to town
Synonyms: ahorse / ahorseback
From wordnet.princeton.edu