How to say "she crossed her arms" in Spanish?
To cross one's arms
She crossed her arms
You cross your arms
I cross my arms or I folded my arms.
As in, The little girl crossed her arms defiantly.
Also,cruzarse de brazos
La niña se cruzó de brazos desafiante.
You should use "cruzarse de brazos", as Melipiru suggested. "Cruzar los brazos" may be misleading, especially in the plural. Something like "nos cruzamos los brazos" seems to suggest that I took your arms and you took mine and we crossed them (somehow). "Nos cruzamos de brazos" does not allow for that confusing interpretation.
You would use "cruzar los brazos".
I suppose the present conjunction would be as follows.
* me cruzo los brazos * te cruzas los brazos * se cruza los brazos * nos cruzamos los brazos * os cruzáis los brazos * se cruzan los brazos
You can work out the rest for yourself.