slump/ sl^mp /

1.noun [c] 
(drop) (in sales,demand etc) 暴跌

2.noun [经济] 
(recession) 经济萧条

3.vi.[person+] 
to slump (into/onto sth) 猛地倒(在某物里/上)

4.vi.[sales] [ demand etc+] 
暴跌

he was slumped over the wheel
他猛地倒在方向盘上