de·fy v. t. [imp. & p. p. Defied p. pr. & vb. n. Defying.]
1. To renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce. [Obs.]
I defy the surety and the bond. --Chaucer.
For thee I have defied my constant mistress. --Beau. & Fl.
2. To provoke to combat or strife; to call out to combat; to challenge; to dare; to brave; to set at defiance; to treat with contempt; as, to defy an enemy; to defy the power of a magistrate; to defy the arguments of an opponent; to defy public opinion.
I once again
Defy thee to the trial of mortal fight. --Milton.
I defy the enemies of our constitution to show the contrary. --Burke.