#1 defy v. [withstand, hold, hold up] resist or confront with resistance; "The politician defied public opinion"; "The new material withstands even the greatest wear and tear"; "The bridge held". wn
#2 defy v. [resist, refuse] elude, especially in a baffling way; "This behavior defies explanation". wn
#3 defy v. [dare] challenge; "I dare you!". wn
vizzz