subvene

From Latin subveniō (“come to the aid of”), from sub (“under, up towards”) + veniō (“come”).

subvene (third-person singular simple present subvenes, present participle subvening, simple past and past participle subvened)

1. (intransitive) To arrive or happen so as to help or support.
   • Bishop Warburton

     A future state must needs subvene to prevent the whole edifice from falling into ruin.