Meaning of “plummet” in the English Dictionary

"plummet" in American English

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plummetverb [ I ]

us /ˈplʌm·ɪt/

to fall very quickly and suddenly:

Temperatures plummeted last night.
The parachute failed to open and he plummeted to the ground.

(Definition of “plummet” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"plummet" in Business English

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plummetverb [ I or T ]

uk /ˈplʌmɪt/ us

to go down in amount or value very quickly and suddenly:

House prices have plummeted in recent months.
plummet (by) sth First-half advertising revenues plummeted 13%, compared with the same period a year ago.
plummet to sth The food retailer's shares plummeted 17.5p to 227.5p.

plummetnoun [ C, usually singular ]

uk /ˈplʌmɪt/ us

a sudden and large reduction in value or amount:

a plummet in sth The petrol retailer denies its 25% dividend hike is to prop up the shares after a plummet in the price from 270p to 118p.

(Definition of “plummet” from the Cambridge Business English Dictionary © Cambridge University Press)