otherwise, not
Si no, no dejarán de darte la lata.
Otherwise, they won't stop bothering you.
— Running on Empty (1988)
Para aprender a nadar tengo que meterme en el agua, si no, no aprendo nada.
To learn how to swim, I have to get in the water; otherwise, I won't learn anything.
Hubo un testigo; si no, no estaría seguro de que fuera él.
There was a witness; otherwise, I wouldn’t be sure it was him.
Si no, no vas a llegar a Chile.
Otherwise, you won't make it to Chile.
— La sociedad de la nieve (2023)
¿Pensó que, si no, no habría venido?
Did you think that otherwise I wouldn’t have come?
— El gran diluvio (2025)