The museum was recently 'plunged into' scandal when it was learned that some of its art had been sold on the black market.
We've been thinking of buying a new car, and yesterday we finally 'took the plunge'. [=we bought a new car]
A series of bad management decisions are responsible for the company's 'plunge into' debt.
(..) gouging out deep valleys. They're the most powerful erosive force on our planet. A moulin - a shaft in the ice opened by melt water as it plunges into the depths of the glacier. Like the water running through it, the ice itself is constantly moving, flowing down the valley (..)2006 TvShow: Planet Earth Title: Mountains Season: 1 Episode 2