to silence ourselves, to keep quiet
Hemos decidido callarnos.
We've decided to keep quiet.
Deberíamos callarnos.
We should shut up.
Teníamos que aceptarlo y callarnos.
We had to accept it and keep quiet.
— Uno de los nuestros (1990)
Ahora tenemos que callarnos.
Now we have to be quiet.
— Victoria (2015)