noun
A sudden or dramatic decrease
verb
To jump or dive quickly and energetically
adjective
Characterized by a sudden or dramatic decrease
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The stock market experienced a plunging trend due to global economic uncertainties.
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I heard that sales are plunging for that new restaurant in town.
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She was so scared of the roller coaster that she was plunging all over the place.
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His heart was plunging with excitement as he waited for the results of the competition.