ti pentirai

you will regret it

→ ti
phrase Rare #43,559
you will regret it Second-person singular future tense of pentirsi, meaning “to regret.” The object of the regret is often understood from context; the phrase can also be translated as “you’ll be sorry.”
IT: Se lasci scappare questa occasione, ti pentirai.
EN: If you let this opportunity pass, you’ll regret it.

Ti pentirai di non avermi ucciso quando potevi.

You'll regret not killing me when you could.

— I Saw the Devil (2010)

Non ti pentirai?

Won't you regret it?

— Vite vendute (1953)

Hah, spero solo che non ti pentirai di questa scelta.

Hah, I just hope you don't regret this choice.

— The Garden of Sinners Chapter 5: Paradox Paradigm (2008)

Non ti pentirai.

You won't regret it.

— Drive (2011)