To confront boldly and courageously
To refuse or fail to obey
To call on another to do something requiring boldness
Defy me, and you will suffer my wrath.
I tried to defy them once.
Algebra and geometry were the only studies that continued to defy my efforts to comprehend them.
It was, however, the first attempt ever made to defy the papal bull.
They wished to defy Europe in order to maintain intact the treaty of San Stefano, and again M.