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English definition of “plunge”

plunge

verb (BECOME LOWER)    /plʌndʒ/
C1 [I] to become lower in value or level very suddenly and quickly: The fall in demand caused share prices to plunge. Our income has plunged dramatically.
(Definition of plunge verb (BECOME LOWER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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