ばかりか

Usage

AばかりかB is used to express 'not only A but also B'

授業が終わるか終わらないかのうちに彼は教室を出た He left the classrom as soon as class ended

彼が電車が止まるか止まらないかのうちにホームに飛び降りた He jumped onto the platform just as the train stopped