plunge (

     n 1: a brief swim in water [syn: dip]
     2: a steep drop
     v 1: Thrust or throw into; "Immerse yourself in the hot water"
          [syn: immerse]
     2: drop steeply; "the stock market plunged" [syn: dive, plunk]
     3: dash violently or with great speed or impetuosity; "She
        plunged at it eagerly"
     4: begin with vigor; "He launched into a long diatribe"; "She
        plunged into a dangerous adventure" [syn: launch]
     5: cause to be immersed; "The professor plunged his students
        into the study of the Italian text" [syn: immerse]
     6: fall abruptly; "It plunged to the bottom of the well" [syn:
     7: immerse into a liquid; "dunk the bread into the soup" [syn:
        dunk, dip, souse, douse]
     8: engross (oneself) fully; "He immersed himself into his
        studies" [syn: steep, immerse, engulf, engross, absorb,
         soak up]