1. Thrust or throw into
   "plunge yourself in hot water";
   - immerse
    
2. Drop steeply
   "the stock market plunged";
   - dive, plunk [informal], dump
    
3. Dash violently or with great speed or impetuosity
   "She plunged at it eagerly"
    
4. Begin with vigour
   "She plunged into a dangerous adventure";
   - launch
    
5. Cause to be immersed
   "The professor plunged his students into the study of the Italian text";
   - immerse
    
6. Fall abruptly
   "It plunged to the bottom of the well"
    
7. Immerse briefly into a liquid so as to wet, coat, or saturate
   "plunge the garment into the cleaning solution";
   - dunk, dip, souse, douse
    
8. Devote (oneself) fully to
   "He plunged himself into his studies";
   - steep, immerse, engross, absorb

1. A brief swim in water
   "They took a quick plunge in the lake to cool off";
   - dip
    
2. A steep and rapid fall
   "The stock market took a sudden plunge, wiping out billions in value"

Derived forms: plunged, plunges, plunging

Type of: alter, begin, center [US], centre [Brit, Cdn], change, come down, concentrate, dart, dash, descend, drop, fall, flash, focus, get, get down, go down, modify, penetrate, pierce, pore, pore over, rivet, scoot [informal], scud, set about, set out, shoot, start, start out, swim, swimming, whip [informal]

Encyclopedia: Plunge