[] slump (from sth) (to sth) | slump (by sth)to fall in price, value etc. suddenly and by a large amount（价格、价值、数量等）骤降，猛跌，锐减◆The share price slumped from more than £3 to £1.股价从 3 英镑以上暴跌至 1 英镑。◆Sales in shopping centres slumped 35 per cent.购物中心的销售额锐减了 35%。➡ see note at increase