backward
He fell backwards.
No tuve el coraje de mirar para atrás.
I didn't have the courage to look back.
Después ya no puedes echarte para atrás.
After that you can't turn back.
Será mejor que se hagan para atrás.
You'd better step back.
Si mira para atrás, quiere decir que está interesada.
If she looks back, it means she's interested.