The story
- Proto-Indo-European*bʰeydʰ-
- Proto-Indo-European*bʰéydʰeti
- Proto-Italic*feiðō
- Latinfīdere
- Vulgar Latin*fīdāre
- Old Spanishfiar
- Spanishfiar
- Spanishfiador
- English todayfiador
Borrowed from Spanish fiador.
Etymology from Wiktionary, CC BY-SA 4.0.