From the Old Irish[Term?] verb fo·dera, earlier fo·fera(“prepares, provides, causes”), reinterpreted as a prepositional phrase using fo (modern Irishfaoi).
Pronunciation
IPA(key):/fˠiːˈdʲaɾˠə/
(Aran) IPA(key):/fˠiːˈdʲaɾʲə/(as if spelled faoi deaire, probably due to influence from aire(“attention, notice”))