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English definition of “plunge”

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plunge

verb [I/T]  /plʌndʒ/ us  
to move or fall suddenly forward, down, or into something: [I] Her car plunged off the cliff. [I] He plunged into the crowd, smiling and shaking hands. [T always + adv/prep] She suddenly plunged the knife into the cake. If a value or price plunges, it suddenly becomes less: [I] Rumors on Wall Street have caused stock prices to plunge. If a person or group plunges into an activity, or a place plunges into a condition, it suddenly experiences it: [I always + adv/prep] The economy was in danger of plunging into a depression. [T always + adv/prep] The storm cut power lines, plunging the town into darkness.

plunge

noun [C]  /plʌndʒ/ us  
a sudden fall forward, down, or into something: A tree broke his plunge downhill. The rapid plunge of the stock market caused panic among investors.
(Definition of plunge from the Cambridge Academic Content Dictionary © Cambridge University Press)
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