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

gadfly

noun
 
/ˈɡædflaɪ/
 
/ˈɡædflaɪ/
(plural gadflies)
(usually disapproving)
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  1. a person who annoys or criticizes other people in order to make them do something
    • He was a political gadfly, turning up at city council meetings and complaining about the waste of taxpayers’ money.
    Word Originlate 16th cent.: from gad, or obsolete gad ‘goad, spike’, from Old Norse gaddr, of Germanic origin; related to yard, the unit of measurement.
See gadfly in the Oxford Advanced American Dictionary
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