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出典:Wiktionary
Rebracketing of mēmet/tēmet/sēmet ipse > mē/tē/sē metipse, made up of -met (“emphatic suffix”) + ipse (“himself”). Attested in Donatus' Ars Grammatica in the fourth century.
met ipse (Vulgar Latin)
Grandgent, Charles Hall (1907) An Introduction to Vulgar Latin (Heath's Modern Language Series), D. C. Heath & Company, page 36
metipse