1. 討人厭者；有意攪擾他人者;（尤指）故意挑戰權威者 If you refer to someone as a gadfly, you believe that they deliberately annoy or challenge other people, especially people in authority.
e.g. It still remains to be seen whether Buchanan will be just a gadfly or a real threat to the president. 布坎南只是故意攪局還是對總統構成真正的威脅，這還有待觀(guān)察。
gadfly英英釋義
gadfly的翻譯
noun
1. any of various large flies that annoy livestock