tu mantenerti

to support you financially

→ mantenere
manten maintain / keep + er infinitive + ti you, to you
verb · second Rare #42,576
to support you financially Infinitive with the pronoun “ti” attached; context determines whether it means “to support you financially” or “to maintain you.”
IT: Non posso mantenerti per sempre.
EN: I can't support you financially forever.
Conjugation of mantenere

Non sarà mai in grado di mantenerti.

He will never be able to support you.

— Picnic (1955)

Erano i giapponesi a mantenerti a Tientsin?

Were the Japanese keeping you in Tientsin?

— L'ultimo imperatore (1987)

E come pensi di mantenerti?

And how do you plan to support yourself?

— The Way He Looks (2014)

Così se le cose non dovessero andare bene, puoi mantenerti.

So if things don't go well, you can support yourself.

— La vita di Adele: Capitoli 1 & 2 (2013)