Where does “controfirmare” come from?
controfirmare (Italian) comes from Italian firmare, from Latin firmō, from Latin Firmus, from Proto-Italic fermos, from Proto-Indo-European dʰer-mo-s, from Proto-Indo-European dʰer- — to support; to hold.
controfirmare (Italian): To countersign
Ancestry of “controfirmare”, step by step