vi.

1. （突然或沉重地）倒下，陷落[Q][（+down）]
   The old man slumped down in a chair.

   老人猛地倒在椅子里。

2. （物价等）下跌；（经济等）衰落；（健康等）下降
   Sales have slumped badly.

   销售量锐减。

vt.

1. 使倒下
2. 使降低；使衰落

n.[C]

1. 暴跌；下降；不景气
   This brought about a heavy slump in prices.

   这引起物价猛跌。

2. 消沉，萎靡；衰退
   There was a serious slump in the 1930s.

   二十世纪三十年代发生严重的经济衰退。

v.

1. sit, lean, or fall heavily and limply.
2. fail or decline substantially or over a prolonged period.

n.

1. an instance of slumping.
2. a prolonged period of abnormally low economic activity.