(of prices, values, or sales) to fall suddenly

The value of property has slumped. 房产价值突然下跌。

Car sales have slumped dramatically over the past year. 过去一年汽车的销售额大幅度下降。

to sit or fall heavily and suddenly

She slumped into the chair, exhausted. 她颓然跌坐在椅子上，筋疲力尽。

a fall in the price, value, sales, etc. of something

There's been a slump in the demand for new cars. 新车的需求量猛跌。

a period when an industry or the economy is in a bad state and there is a lot of unemployment

an economic slump 经济萧条

The airline industry is currently in a slump. 当前航空业正处于萧条期。