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English definition of “plunge”

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plunge

verb uk   /plʌndʒ/ us  

plunge verb (FALL)

C2 [I or T, usually + adv/prep] to (cause someone or something to) move or fall suddenly and often a long way forward, down, or into something: We ran down to the beach and plunged into the sea. The car went out of control and plunged over the cliff. Cook the peas by plunging them into boiling water. Niagara Falls plunges 55.5 metres.
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plunge verb (BECOME LOWER)

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.

plunge

noun [C] uk   /plʌndʒ/ us  

plunge noun [C] (MOVEMENT)

a sudden movement or fall forward, down, or into something: I really enjoyed my plunge (= jumping in and swimming) in the pool.

plunge noun [C] (REDUCTION)

a sudden and large fall in value or level: We are expecting a plunge in profits this year.
(Definition of plunge from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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