will hold out, will last, will keep (someone) informed, will stick to
Elle tiendra ce qu'il faudra, même si elle doit s'écrouler après.
She'll hold out for as long as necessary, even if she has to collapse afterward.
— Les Diaboliques (1955)
We will keep you informed.
Notre cercle tiendra sa réunion mensuelle mercredi prochain.
Our circle will hold its monthly meeting next Wednesday.
Thomas nous tiendra au courant.
Thomas will keep us updated.