in this, in it
Agora, o que significa estar juntos nisto?
So, what does it mean to be in this together?
— Psicose (1960)
Tenho trabalhado nisto há três semanas.
I've been working on this for three weeks.
How much did you spend on this?
Eu acredito sinceramente nisto.
I sincerely believe this.
Take a look at this.