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

 

oppressor

 noun
noun
BrE BrE//əˈpresə(r)//
 
; NAmE NAmE//əˈpresər//
 
 
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a person or group of people that treats somebody in a cruel and unfair way, especially by not giving them the same rights, etc. as other people They cannot forget the humiliation they suffered at the hands of their oppressors.
See the Oxford Advanced American Dictionary entry: oppressor