- n a brief swim in water
- n a steep and rapid fall
- v thrust or throw into
- v drop steeply
the stock market plunged
- v dash violently or with great speed or impetuosity
She plunged at it eagerly
- v begin with vigor
She plunged into a dangerous adventure
- v cause to be immersed
The professor plunged his students into the study of the Italian text
- v fall abruptly
It plunged to the bottom of the well
- v immerse briefly into a liquid so as to wet, coat, or saturate
- v devote (oneself) fully to
- The CEO of cell-phone-software maker Openwave had seen his firm's stock plunge more than a third in a single week, and he was about to address jittery investors.
- When Rosie and ABC couldn't come to an agreement for her to return to the program next fall, it was for me a plunge on the roller coaster.
- That's why we need Spyfish, a gadget for divers who aren't quite ready to take the plunge.