In Latin, “fibulare” meant “to pin” or “to buckle together.” It came from the noun “fibula,” which was a clasp somewhat resembling a safety pin, used to fasten clothing. The Latin verb “infibulare” described a sort of ceremonial pinning of the “fibula.” The English word follows, meaning “to fasten with a buckle or clasp.” You might recognize the word “fibula” as also referring to one of the bones in the lower leg. It’s named as such because the shape formed with the tibia resembles a clasp, with the fibula forming the pin.