to warn, to let (someone) know
Ligou pra ele pra avisar quando o portador iria chegar?
Did you call him to let him know when the courier would arrive?
— Caminhos do Crime (2026)
Ele voltou para casa sem nos avisar.
He went back home without telling us.
Nós tentamos avisar, mas você não escutou.
We tried to warn you, but you didn't listen.
— Hum Dil De Chuke Sanam (1999)
Esqueci de avisar que chegaria tarde.
I forgot to let you know that I would be arriving late.
— Ele Está de Volta (2015)
Temos que avisar o tio Alfredo agora.
We have to let Uncle Alfredo know now.
— The Hand of God: A Mão de Deus (2021)
Ele não teria ido a lugar nenhum sem nos avisar, a não ser que fosse impedido.
He wouldn't have gone anywhere without telling us, unless he was prevented from doing so.
— Psicose (1960)