tu t'en souviendras

you will remember it

→ tu
phrase Rare #43,873
you will remember it The future tense of se souvenir de, meaning “to remember.” En replaces de plus the thing being remembered; depending on context, it can mean “you’ll remember that” or “you’ll remember it.”
FR: Tu t'en souviendras quand tu seras plus vieux.
EN: You’ll remember it when you’re older.

Tu t'en souviendras?

Will you remember?

— Les Anges déchus (1995)

Tu t'en souviendras toute ta vie.

You’ll remember it for the rest of your life.

Tu t'en souviendras.

You'll remember it.

— Le repentir (1987)

Comme ça, tu t'en souviendras.

That way, you'll remember.

— Nobody Knows (2004)