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gadfly (noun) a fly that bites cattle; a person who annoys others by criticizing them.
A gadfly is an insect that bites animals, especially cattle. A person who annoys others by criticizing them is a gadfly. A person that is a gadfly irritates and vexes others to the point of forcing them to do what they want them to do. A gadfly gets things done by others by criticizing them.
- The gadfly that he is, James never loses the opportunity of getting things done by others by driving them impatient with his criticism.
- What a mosquito is to human beings, is the gadfly to cattle. They are both nuisances to their victims.