- machine that performs dependably under heavy use; "the IBM main frame computers have been the workhorse of the business world"
- a horse used for plowing and hauling and other heavy labor
- A draft horse (US), draught horse (UK) or dray horse (from the Anglo-Saxon dragan meaning to draw or haul; compare Dutch dragen meaning to carry), less often called a heavy horse, is a large horse bred for hard, heavy tasks such as ploughing and farm labour. ...
- A horse used primarily for work; a draft horse; Anyone or thing that does a lot of work; who works consistently or regularly
- n. A basic labor steamjack. "Take one of the workhorses from down the dock to do the heavy liftin’."