workhorse: Meaning and Definition of
work•horse
Pronunciation: (wûrk'hôrs"), [key] — n.
- a horse used for plowing, hauling, and other heavy labor, as distinguished from a riding horse, racehorse, etc.
- a person who works tirelessly at a task, assumes extra duties, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.