cannot be undone
Lo que está hecho no se puede deshacer.
What's done cannot be undone.
Lo que hiciste no se puede deshacer.
What you did can't be undone.
No se puede deshacer lo que ya se ha hecho.
You can't undo what's already been done.
Tom no se puede deshacer de su tos.
Tom can't get rid of his cough.