back-formation
noun/ˈbæk fɔːmeɪʃn/
/ˈbæk fɔːrmeɪʃn/
[uncountable, countable] (linguistics)- a word formed by removing or changing the end of a word that already exists. For example, commentate is a back-formation from commentator.
逆构词法（将已存在的词通过去除或改变其后缀构成新词。如 commentate 由 commentator 一词逆构而成）