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

 

blighter

 noun
noun
BrE BrE//ˈblaɪtə(r)//
 
; NAmE NAmE//ˈblaɪtər//
 
(old-fashioned, British English, informal)
 
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a way of referring to a person (usually a man) that you either find unpleasant or that you feel some sympathy for Word Origin early 19th cent.: from blight + -er.