one by one
A Hidalgo le quitaron uno a uno, como para ofenderlo, los vestidos de sacerdote.
They stripped Hidalgo of his priestly vestments one by one, as if to insult him.
Uno a uno, van muriendo de frío.
One by one, they are dying of cold.
— Aguirre, la ira de Dios (1972)
Uno a uno los traficantes del barrio Tanque iban a morir.
One by one, the drug dealers from the Tanque neighborhood were going to die.
— Tropa de Élite 2 (2010)