Definition of grunt work noun from the Oxford Advanced Learner's Dictionary

 

grunt work

 noun
noun
BrE
 
; NAmE
 
[uncountable](informal)
 
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hard boring work She has assistants to do the grunt work like research and proofreading. There’s a lot of grunt work involved in the assignment. I was used to grunt work but pouring concrete was the worst.
See the Oxford Advanced American Dictionary entry: grunt work