0 past simple and past participle of plunge
1 to (cause someone or something to) move or fall suddenly and often a long way forward, down, or into something:
2 to become lower in value or level very suddenly and quickly:
The lack of employment in this part of the country is causing house prices to plunge.
Desperately needing to cool off, I plunged my hands into the cold water and threw it over my face.
Because this excessive capacity has rapidly depleted fish stocks, profitability has plunged, reducing the value of ships on the market.
When deteriorating health leads to the need for round-the-clock care for frail members, busy working families are often plunged into crisis.
Not surprisingly, the welfare economists plunged into the breach.
