tumble [ˈtʌmb(ə)l] ① v.（使）摔倒，跌落；（价格或数量）暴跌，骤降 ② n.（尤指从高处的）倒下，跌落；（水平的）下降

例句 This binary way of thinking, seeing retirement as a cliff edge over which
workers and consumers suddenly tumble, bears little relation to the real
world.【2017-7《经济学人》】
将退休视为“悬崖”，员工和消费者将突然从崖边跌落—这种非此即彼的思维方式与现实世界不符。