Adjective ahorse has 1 sense
  1. ahorse, ahorseback - traveling on horseback; "a file of men ahorseback passed by"
    Antonyms: nonmoving, unmoving (indirect, via moving)
,Adverbial ahorse has 1 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"
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