you'll regret it
Si intentas hacer daño a mi familia o a mí te arrepentirás, te lo garantizo.
If you try to harm my family or me, you will regret it—I guarantee it.
— Caché (Escondido) (2005)
You’ll regret it.
Si lo dejas, te arrepentirás toda la vida.
If you let it go, you'll regret it for the rest of your life.
— Adiós, muchachos (1987)
You’ll regret it terribly.
Try it, you won't regret it.
No pierdes nada y te arrepentirás si no lo haces.
You have nothing to lose and you'll regret it if you don't.
— Love Actually (2003)
Jamás te arrepentirás de esto.
You’ll never regret this.
Te arrepentirás de lo que has hecho.
You will regret what you have done.