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French word falloir comes from Old French falt, Proto-Indo-European *gʰwel-
falt (Old French)
*gʰwel- (Proto-Indo-European)
falleir (Old French)
fallere (Latin)
*falleir (Old French)
faloir (Old French)
falloir (French)
(impersonal) to be necessary. (reflexive, with "en") to be missing. To take (time).