workhorse Syllabification: (work·horse)Pronunciation: /ˈwərkˌhôrs/Translate workhorse | into Italian Definition of workhorse noun a horse used for work on a farm. a person or machine that dependably performs hard work over a long period of time:he was a workhorse of an actor, often appearing in as many as forty plays in a yearworkhorse in other Oxford dictionaries Definition of workhorse in the British & World English dictionary