1. To break or fail to follow established rules, procedures, or official guidelines in a formal or diplomatic context
The ambassador was criticized for violating protocol by speaking out of turn during the summit.
O embaixador foi criticado por violar protocolo ao falar fora de hora durante a cúpula.
2. To disregard formal procedures or etiquette in professional, medical, legal, or governmental settings
The doctor was sued for violating protocol by operating without proper authorization.
O médico foi processado por violar protocolo ao operar sem autorização adequada.