Definition of do-gooder noun from the Oxford Advanced Learner's Dictionary

 

do-gooder

 noun
noun
BrE
 
; NAmE
 
(informal, disapproving)
 
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a person who tries to help other people but who does it in a way that is annoying Members of the church are not just a bunch of do-gooders.
See the Oxford Advanced American Dictionary entry: do-gooder