lo lamentarás

you'll regret it

→ lo
phrase Rare #34,346
you'll regret it A future-tense warning or prediction. The pronoun “lo” refers to something previously mentioned or understood from context.
SP: Si no estudias, lo lamentarás.
EN: If you don't study, you'll regret it.

No lo lamentarás.

You won't regret it.

Lo lamentarás.

You'll regret it.

Llegará el día en que lo lamentarás.

The day will come when you will regret it.

Si no vienes, lo lamentarás.

If you don't come, you'll regret it.

— Parásitos (2019)

Un día lo lamentarás.

One day you'll regret it.

No malgastes tu juventud, si no, lo lamentarás más tarde.

Don't waste your youth, or you'll regret it later.

Si mientes, lo lamentarás.

If you lie, you will regret it.

— Yojimbo. El mercenario (1961)

Llegará la hora en que lo lamentarás.

The time will come when you will regret it.