plunge definition

1. a steep and rapid fall
2. dash violently or with great speed or impetuosity
• examples: She plunged at it eagerly
3. begin with vigor
• examples: He launched into a long diatribe
• examples: She plunged into a dangerous adventure
4. cause to be immersed
• examples: The professor plunged his students into the study of the Italian text
5. fall abruptly
• examples: It plunged to the bottom of the well