いっしんいったい

一進一退

表記・読み：いっしんいったい

1. 1

   now advancing and now retreating; ebb and flow; seesawing; taking alternately favorable and unfavorable turns

   名詞noun or participle which takes the aux. verb suru自動詞nouns which may take the genitive case particle 'no'yojijukugo