the day before yesterday
Anteontem você impressionou a todos, mas eu já o conhecia.
The day before yesterday you impressed everyone, but I already knew you.
Four o'clock in the afternoon the day before yesterday.
— Carandiru (2003)
I dreamed about an angel the day before yesterday.
— Andrei Rublev (1966)
Meus amigos me visitaram anteontem.
My friends visited me the day before yesterday.
Encontramos a mobilete onde ele passou a noite de anteontem.
We found the moped where he spent the night before last.
— Diva: Paixão Perigosa (1981)
Anteontem foi terça-feira; depois de amanhã é sábado.
The day before yesterday was Tuesday; the day after tomorrow is Saturday.