1. Travelling on horseback
   "a file of men ahorseback passed by"
   - ahorse

1. On the back of a horse
   "policeman patrolled the streets ahorseback"
   - horseback, ahorse

See also: moving

• billowing
• billowy
• billy
• billy buttons
• billy club
• billy goat
• Billy Graham
• Billy Mitchell
• Billy Sunday
• Billy Wilder
• billy-ho
• billycan
• billyo
• billyoh
• billystick
• bilobate
• bilobated
• bilobed
• bilocation
• bilocular
• bilocular capsule
• biloculate
• Biloxi
• bilsted
• biltong