Definition of "workhorse" []

• Something, such as a machine, that performs dependably under heavy or prolonged use: "the 50-year-old DC-3 ... one of aviation's most effective workhorses” ( Christian Science Monitor). (noun)
• A horse that is used for labor rather than for racing or riding. (noun)
• Informal A person who works tirelessly, especially at difficult or time-consuming tasks. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Even through all the aches and pains, Buehrle has made a mockery of the term workhorse starting pitcher."
• "This is also the first major gig I've been using my Line6 Variax® as the main workhorse of the show."
• "The Chinook, the Army's workhorse, is designed to transport troops and supplies to combat and other regions."