/ˈtʌmbl ||; ˈtʌmbḷ/verb[I] 1 to fall down suddenly but without serious injury 突然摔倒、跌倒或倒下（但没受重伤）: He tripped and tumbled all the way down the steps. 他绊了一跤，一直滚到台阶下面。
2 to fall suddenly in value or amount （价值或数量）骤降，急跌: House prices have tumbled. 房屋价格突然下跌了。
3 to move in a particular direction in an untidy way 胡乱朝某方向移动:
She opened her suitcase and all her things tumbled out of it. 她一打开手提箱，所有的东西都掉了出来。
tumble noun [C]
tumble down to fall down; to collapse 倒塌:
The walls of the old house were tumbling down. 那幢旧房子的墙纷纷在倒塌。