1horse·back 
/ˈhoɚsˌbæk/ noun
/ˈhoɚsˌbæk/ noun Meaning:
on horseback
: on the back of a horse
▪ Before the invention of the automobile, people often traveled on horseback. [=they traveled by riding horses]
▪ Before the invention of the automobile, people often traveled on horseback. [=they traveled by riding horses]
