irregular conjugation; irregular verb
A grammatical term referring to verbs that do not follow regular conjugation patterns, such as する and 来る. Contrasts with 正格活用 (regular conjugation).
See also: 正格活用
「する」と「来る」は変格活用の動詞です。
"Suru" and "kuru" are irregular conjugation verbs.
r-irregular conjugation (classical Japanese)