Where does “bersela” come from?

bersela (Italian) comes from Italian bere, from Italian bevere, from Latin bibere, from Latin bibō, from Latin -ilis, from Proto-Italic -elis, from Proto-Indo-European -elis, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

bersela (Italian): to naively believe in something unlikely; to be "taken in"