workhorse

These monsters have supplanted coal generators as the workhorses of the U.S. power grid because they are more efficient, less polluting and more flexible.

But the system is not reusable, unlike SpaceX's Falcon 9 workhorse.

What Snell hasn’t done, however, is prove himself to be a workhorse.

SpaceX primarily provides launch services to commercial and military satellite customers with its workhorse Falcon 9 rocket, which has a payload of up to 23 metric tons.

You see football like an ideal world when you are out of the game and you would love to work there, and when it becomes your everyday work, it's just a workhorse.