Definition of workhorse noun from the Oxford Advanced Learner's Dictionary

 

workhorse

 noun
noun
BrE BrE//ˈwɜːkhɔːs//
 
; NAmE NAmE//ˈwɜːrkhɔːrs//
 
 
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a person or machine that you can rely on to do hard and/or boring work
See the Oxford Advanced American Dictionary entry: workhorse