free fall
noun [ U ] uk/ˌfriː ˈfɔːl/ us/ˌfriː ˈfɑːl/
（重力作用下的）自由下落，自由落体运动
an occasion when something or someone falls quickly under the influence of gravity
informal（价值或力量的）骤降，迅速下降
the process of failing or losing value or strength quickly and continuously
Only massive changes in government policies will prevent the peso going into free fall (= falling quickly in value by a large amount). 只有大刀阔斧地改革政府现行政策，才能阻止比索急剧贬值。