Workhorse (noun)

1. A horse that is used for heavy labor or work.
2. A machine or device that is reliable and does a lot of work, often without complaining.

Origin:

The word workhorse originated in the late 16th century from the phrase 'a horse used for work.'.

Examples:

1. John's truck is a true workhorse, always ready to carry heavy loads and take him wherever he needs to go.
2. That old laptop may be slow, but it's a real workhorse and just keeps chugging along.
3. The draft horses were the workhorses of the farm, plowing the fields and hauling loads of hay.
4. The photocopier may not be the latest and greatest model, but it is a real workhorse and always does the job.
5. When it comes to carrying heavy loads, the pickup truck is the workhorse of the automotive world.