1. To resist, challenge, or oppose established rules, authorities, or conventional ways of doing things
She decided to buck the system and start her own business instead of following the traditional career path.
Ela decidiu desafiar o sistema e começar seu próprio negócio em vez de seguir o caminho profissional tradicional.
2. To go against the grain; to act in defiance of societal expectations or institutional norms
The activists were bucking the system by protesting against government policies.
Os ativistas estavam desafiando o sistema ao protestar contra as políticas governamentais.