約束破る やくそくやぶる Also written 約束やぶる Meanings Expression, Godan verb to break a promise; to go back on one's word; to renege See also: 約束を破る (やくそくをやぶる). Kanji 約 promise. Read as ヤク. 束 bundle. Read as ソク. 破 break. Read as やぶる. Jinuma: Japanese Dictionary · Word lists