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

 

avenger

 noun
noun
BrE BrE//əˈvendʒə(r)//
 
; NAmE NAmE//əˈvendʒər//
 
(formal)
 
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a person who punishes or hurts somebody in return for something bad or wrong that has been done to them, their family or friends