workhorse

work·horse  (wûrkhôrs)

n.

1. 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.

2. A horse that is used for labor rather than for racing or riding.

3. Informal A person who works tirelessly, especially at difficult or time-consuming tasks.

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workhorse

Noun

a person or thing that does a lot of work, esp. dull or routine work: this plane is the workhorse of most short-haul airlines

Thesaurus

Noun	1.	workhorse - machine that performs dependably under heavy use; "the IBM main frame computers have been the workhorse of the business world" machine - any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
	2.	workhorse - a horse used for plowing and hauling and other heavy labor Equus caballus, horse - solid-hoofed herbivorous quadruped domesticated since prehistoric times plough horse, plow horse - a horse used to pull a plow draft horse, draught horse, dray horse - horse adapted for drawing heavy loads packhorse - a workhorse used as a pack animal dobbin, farm horse - a quiet plodding workhorse