nosedive
[ˈnoʊzdaɪv]
n.
急剧下降;
急转直下;
暴跌;
（飞行器的）俯冲;
vi.
（价格、费用等）骤降;
急剧下跌;
（飞行器）俯冲;
例句:
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The bank yesterday revealed a 30 per cent nosedive in profits.
该银行昨天透露其利润骤降30％。
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Oil prices took a nosedive in the crisis.
危机期间，石油价格暴跌。
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He told the tribunal his career had "taken a nosedive" since his dismissal last year.
他告诉仲裁委员会，自去年被解雇以来，他的职业生涯就陷入了低谷。
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But after tea Kent's innings went into a terminal nosedive.
来自THETIMES
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Sterling's nosedive is a clear warning that investors' patience is running out.
来自THETIMES
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If you plotted hopes for The Ting Tings' second album on a graph, the result would be a drawn-out, four-year nosedive.
来自BBC