Noun
A horse used primarily for manual labor; a draft horse.
Synonyms: (Britain, dialectal, one sense) aver, draft horse
(by extension) Someone or something that does a lot of work; something or someone who works consistently or regularly.
Those old machines are not very glamorous, but even 20 years after their introduction, they are still the workhorses of the industry.
My offensive player of the year is going to be Javon Ringer for the way he has carried his team and the workhorse load that he's carried all year long. Everyone knows he's getting the football yet he continues to produce. Javon Ringer
Elvis was incredibly cooperative. He would try anything. He wasn't a diva, no prima donna. When it came to work, he was a workhorse. Jerry Leiber
It's thought of as an eccentric thing for an actor to really try to maintain quality control through the whole career. Most people think, 'You just work. You just keep working.' And in some ways I wish I could be a guy who's just a workhorse. John C. Reilly
I think of myself more as a workhorse actor. It will be hot and cold and up and down, but no one will kick me out of the business. Kevin Bacon
I've always been a workhorse. Jewel
After its first flight in April 1983, Challenger quickly became the workhorse of NASA 's Space Shuttle fleet, flying far more missions per year than Columbia. Source: Internet