fias
fias is a Latin form of fio, meaning “become, be made; happen”. It is the 2nd person singular present active subjunctive.
Found 29 times in the Latin texts on Socratos.
Where it is used
Cicero, Letters to his Friends 1.7.1: legi tuas litteras, quibus ad me scribis gratum tibi esse, quod crebro certior per me fias de omnibus rebus et meam erga te benevolentiam facile perspicias; quorum alterum mihi, ut te plurimum diligam …
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.