will repay, will pay back
Je vous revaudrai ça.
I'll pay you back for that.
Je vous le revaudrai.
I will repay you.
Je lui revaudrai ça l'an prochain, promis.
I'll pay him back next year, I promise.
— La Guerre des étoiles (1977)
Je te le revaudrai.
I'll pay you back.
Je te revaudrai ça.