上かみ二に段だん活かつ用よう

noun

upper bigrade conjugation; nidan verb conjugation (classical Japanese)

A classical Japanese verb conjugation class where the stem vowel alternates between /i/ and /u/ across forms. Modern Japanese verbs that were originally 上二段 have mostly shifted to 上一段 (upper monograde) conjugation.

• 古こ典てん文ぶん法ぽうでは「起おく」は上かみ二に段だん活かつ用ようの動どう詞しです。

  In classical grammar, 起く is an upper bigrade conjugation verb.

• 上かみ二に段だん活かつ用ようは、未み然ぜん形けいが「い」段だん、連れん用よう形けいが「い」段だん、終しゅう止し形けいが「う」段だんになる活かつ用ようです。

  Upper bigrade conjugation is a conjugation where the irrealis form ends in the /i/ row, the continuative form ends in the /i/ row, and the terminal form ends in the /u/ row.