Another phrase from Dinneen p. 620 --
"lá féile failc (corruption fairc) Epiphany" under the headword 'lá'.
DIL has "failc a gap, chasm? a gap-toothed person?" and "folc heavy rain,
wet weather". Could the phrase in Dinneen be related to either of these
words? Or to something else? Thanks, Liz