3. (4) plunge -- (dash violently or with great speed or impetuosity; "She plunged at it eagerly")
4. (4) plunge, launch -- (begin with vigor; "He launched into a long diatribe"; "She plunged into a dangerous adventure")
5. (1) plunge, immerse -- (cause to be immersed; "The professor plunged his students into the study of the Italian text")
6. plunge, dump -- (fall abruptly; "It plunged to the bottom of the well")
7. dunk, dip, souse, plunge, douse -- (immerse briefly into a liquid so as to wet, coat, or saturate; "dip the garment into the cleaning solution"; "dip the brush into the paint")
8. steep, immerse, engulf, plunge, engross, absorb, soak up -- (engross (oneself) fully; "He immersed himself into his studies")