inform him
We need to warn him.
Desculpe por avisá-lo em cima da hora.
Sorry for letting you know at the last minute.
— Conflitos Internos (2002)
Tentei avisá-lo para salvá-lo.
I tried to warn him in order to save him.
— Durante a Tormenta (2018)
Tive a difícil tarefa de avisá-lo que iria repetir de ano.
I had the difficult task of informing him that he would be repeating the year.
— Relatos Selvagens (2014)