(1)反対方向に戻る変化が生じること
(2)the occurrence of a change in direction back in the opposite direction
さらに詳しく
(1)前の状態に戻る
(2)コースを引き返す
(3)retrace one's course; "The hikers got into a storm and had to turn back"
(4)go back to a previous state; "We reverted to the old rules"
