What is the origin of metathesis?
In linguistics, metathesis is the transposition of two consecutive letters or sounds of a word, as in the now nonstandard pronunciation aks for ask (Old English has the verbs áscian and axian, and Middle English has asken and axen). Every well-disciplined schoolboy knows that in Greek quantitative metathesis is the change of long vowel + short vowel, e.g., ēo, to short vowel + long vowel, eō. Metathesis comes via Late Latin metathesis “transposition of the letters of a word,” from Greek metáthesis “change, change of position, transposition,” a compound formed of the common Greek preposition and prefix metá, meta– “with, in the middle of, among” (metá is related to German mit and Old English mid “with,” as in the first syllable of midwife). Thésis “placing, location, setting” is a derivative of the verb tithénai “to put, place,” from the very common Proto-Indo-European root dhē– “to place, put,” and the source of Latin facere “to do” and English do. Metathesis entered English in the 16th century.