noun (plural gadflies)
1A fly that bites livestock, especially a horsefly, warble fly, or botfly.
- Later, Hera sent the notorious gadfly to continuously bite and irritate Io.
- She was tormented by a furious little gadfly that bit her mercilessly, though she flicked her tail this way and that.
- Zeus had once tried to seduce the lovely Io, but Hera, his jealous wife, had discovered her husband's intentions and turned poor Io into a cow, left to wander about the earth, constantly pursued and tormented by a pestilent gadfly.
1.1An annoying person, especially one who provokes others into action by criticism.
- But he admits he is curious: what has the liberal gadfly done to annoy so many conservatives like him?
- The gadfly soon became an annoyance to both the MTA and the union, creating a newsletter which aired workers' grievances but criticised alleged union inaction.
- I have always considered him sort of a Socratic gadfly.
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