Word parts horse + back Pronunciation (US) IPA (key): /ˈhɔrsˌbæk/ (UK) IPA (key): /ˈhɔːsˌbæk/ Audio (US)(file) Noun Singular horseback Plural horsebacks The back of a horse. They came on horseback across the plains.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads