workhorse

1. Machine that performs dependably under heavy use (synset 104608649)
   "the IBM main frame computers have been the workhorse of the business world"
   is a type of: machine - any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
2. A horse used for plowing and hauling and other heavy labor (synset 102388962)
   is a type of: equus caballus, horse - solid-hoofed herbivorous quadruped domesticated since prehistoric times
   subtypes:

   • 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

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