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English definition of “lunatic fringe”

lunatic fringe

noun [C usually sing]  /ˈlu·nəˌtɪk ˈfrɪnj/
the members of a group whose opinions are extreme and different from those of the rest of the group: Roosevelt attacked the reformers as a lunatic fringe.
(Definition of lunatic fringe noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

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