subvene
To arrive or happen so as to help or support.
intransitive
A future state must needs subvene to prevent the whole edifice from falling into ruin.
To subsidize or defray.
rare, transitive
Where it comes from
From Latin subveniō (“come to the aid of”), from sub (“under, up towards”) + veniō (“come”).
Adapted from the Wiktionary entry subvene (CC BY-SA 4.0).