This is the 6988th most frequent Portuguese word.
irmão
Brother.
Here, 'irmão' is used to refer to a sibling, specifically a brother.
Meu irmão gosta de jogar futebol aos sábados.
My brother likes to play soccer on Saturdays.
In this sentence, 'irmão' is metaphorically used to describe a close friend with a bond similar to that of siblings.
Eu considero meu melhor amigo como um irmão.
I consider my best friend as a brother.
Here, 'irmão' is employed as a colloquial term of camaraderie or friendship, often used among peers.