1. to resist or refuse to obey established rules, regulations, or authority
The teenager decided to defy rules and stay out past curfew.
O adolescente decidiu desafiar as regras e ficar fora depois do toque de recolher.
2. to act in a way that goes against established norms or expectations
She chose to defy rules by wearing unconventional clothing to the formal event.
Ela optou por desafiar as regras usando roupas não convencionais no evento formal.