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出典:Wiktionary
Calque of Ancient Greek εἰς ὄνῠχᾰ (eis ónukha, literally “to a nail”): an expression borrowed from sculptors, who, in modelling, give the finishing touch with the fingernail, or from joiners, who test the accuracy of joints in wood by the fingernail.
ad unguem (not comparable)
ad unguem