Metathesis

Definition and stakes

Christian Brothers,  Aids to the Pronunciation of Irish (1905)

“ The two methods employed in Irish for keeping the words short are Syncope and Metathesis.
Syncope may be described as the telescoping of a word, whenever a grammatical inflection or a suffix commencing with a vowel is added. A short vowel or digraph in the last syllable of a word of more than one syllable is usually elided and the consonants brought together whenever the word is lengthened. The bringing together of the consonants frequently results in one of them becoming silent (§ 128) , or else a short helping vowel may develop.
”
Source: Wikisource

Portrait of C. H. Grandgent C. H. Grandgent,  An Outline of the Phonology and Morphology of Old Provençal

“ The treatment of the various cons. + w groups, which was discussed in § 72, may be illustrated by habuit > ac [133] , crēvit ✱crēvuit > crẹc [134] ; nŏcuit > nǫc [135] ; sēdit ✱sĕduit > sęc, pŏtuit > pǫc; valuit > valc [136] , tĕnuit ✱tēnuit > tẹnc [137] , mĕruit > męrc; sapuit > saup [138] : the noteworthy features are the change of u to -c (through w, gw, g) , the absorption of the preceding consonant unless it be a liquid, a nasal, or a p, the preservation of the liquid or nasal, and the metathesis of the p. ”
Source: Gutenberg

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