"ahorseback" in the adjective sense
1. ahorse, ahorseback
traveling on horseback
"a file of men ahorseback passed by"
"ahorseback" in the adverb sense
1. horseback, ahorse, ahorseback
on the back of a horse
"he rode horseback to town"
"managed to escape ahorse"
"policeman patrolled the streets ahorseback"
Source: WordNet® (An amazing lexical database of English)
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