MÉITHE was the name of a hill in Mag Mugna, according to a scribal note in the Book of Leinster, and CÉITHE was the name of another hill. Neither, it would seem, was very high, for the expression DE MÉITHE FOR CÉITHE appears in several texts and seems to refer to swapping a thing of little value or use for something equally insignificant. In an early glossary, going from MÉITHE to CÉITHE is compared to going ‘from a piglet to a lamb, i.e. from a small thing to a small thing’ (de urc for uan .i. de bec for bic).
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