plummet

plummet
(plummeted, plummeting )
  1. [no obj.]fall or drop straight down at high speed
    快速落下，陡直落下
    a climber was killed when he plummeted 300 feet down an icy gully.
    一位登山者从300英尺高处陡然掉到一个冰谷里给摔死了。
    ■decrease rapidly in value or amount
    （在价值或数量上）骤然下跌，陡然下降
    hardware sales plummeted.
    硬件销售量陡然下降。
noun
  1. a steep and rapid fall or drop
    骤跌，陡跌，骤降
  2. a plumb or plumb line
    铅锤；铅锤线
语源
  1. late Middle English (as a noun): from Old French plommet 'small sounding lead', diminutive of plomb 'lead'. The current verb sense dates from the 1930s
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