workhorse

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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