Definition of hatchet man noun from the Oxford Advanced Learner's Dictionary

 

hatchet man

 noun
noun
BrE
 
; NAmE
 
(informal)
 
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a person employed by an organization to make changes that are not popular with the other people who work there Word Origin late 19th cent. (originally US): figuratively, from an early use denoting a hired Chinese assassin.
See the Oxford Advanced American Dictionary entry: hatchet man