metathesis
【正确答案】：Soundchangeasaresultofsoundmovementisknownasmetathesis.Itinvolvesareversalinpositionoftwoneighboringsoundsegments.Forexample,the［r］soundinOldEnglishwords“bridd”and“hros”wasmovedtotherightofthevowelsoundsintheirModernEnglishcounterparts“bird”and“horse”.
