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1. Thrust or throw into
   - immerse
    
2. Drop steeply
   "the stock market plunged"
   - dive, plunk
    
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"
   - dump
    
7. Immerse briefly into a liquid so as to wet, coat, or saturate
   - dunk, dip, souse, douse
    
8. Devote (oneself) fully to
   - steep, immerse, engulf, engross, absorb, soak up

1. A brief swim in water
   - dip
    
2. A steep and rapid fall

Derived forms: plunged, plunges, plunging

See also: plunger

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

Encyclopedia: Plunge