to reverse; to back up
Bien, ahora que estás aquí, no podemos dar marcha atrás.
Well, now that you're here, there's no going back.
— Carandiru (2003)
Mira por el retrovisor antes de dar marcha atrás.
Check your rearview mirror before reversing.
Tom no va dar marcha atrás.
Tom isn’t going to back down.