the bottom falls out of sth. 汉语意思： （市场、行情等）骤然崩溃、一落千丈 （需求、价格）突然跌到谷底 （引申）某事物的支撑彻底垮掉 例句： The bottom fell out of the housing market last year. 去年房地产市场一落千丈。 When the bottom fell out of oil prices, many firms went bankrupt. 油价暴跌时，许多公司都破产了。