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dar marcha atrás

to reverse; to back up

→ dar
phrase Rare #37,606
to reverse; to back up Used literally for moving a vehicle backward and figuratively for changing one's mind or abandoning a decision.
SP: Mira por el retrovisor antes de dar marcha atrás.
EN: Look in the rearview mirror before backing up.

El camión casi atropelló al niño al dar marcha atrás.

The truck almost ran over the child as it reversed.

Mira por el retrovisor antes de dar marcha atrás.

Check your rearview mirror before reversing.

Bien, ahora que estás aquí, no podemos dar marcha atrás.

Well, now that you're here, there's no going back.

— Carandiru (2003)

Tom no va dar marcha atrás.

Tom isn’t going to back down.