plummet
verb [ I or T ]
uk/ˈplʌmɪt/ usto 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.
plummet
noun [ C, usually singular ]
uk/ˈplʌmɪt/ usa 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.