you'll regret it
Si tu redis ça, tu vas le regretter.
If you say that again, you'll regret it.
— Le prisonnier du Caucase (1996)
Si tu dégages pas, tu vas le regretter.
If you don’t get out of here, you’ll regret it.
— Men in Black (1997)
Éloigne-toi de mon homme ou tu vas le regretter !
Stay away from my man, or you’ll regret it!
— Carandiru (2003)
You'll regret it.
Et si tu n'y vas pas, tu vas le regretter !
And if you don't go, you'll regret it!
— Parasite (2019)
Si tu me trompes, tu vas le regretter.
If you cheat on me, you'll regret it.