1. to publicly question or confront someone's authority, statement, or action in a direct and unambiguous way
She decided to challenge openly the company's unfair policies during the meeting.
Ela decidiu desafiar abertamente as políticas injustas da empresa durante a reunião.
2. to dare someone to prove or defend their position without hesitation or discretion
The activist chose to challenge openly the politician's claims about corruption.
O ativista escolheu desafiar abertamente as afirmações do político sobre corrupção.