workhorse
1. machine that performs dependably under heavy use - the IBM main frame computers have been the workhorse of the business world • Hypernyms: machine 2. a horse used for plowing and hauling and other heavy labor • Hypernyms: horse, Equus caballus • Hyponyms: plow horse, plough horse, draft horse, draught horse, dray horse, packhorse, farm horse, dobbin
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