Webster's English Dictionary

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plunge

1. plunge \'pl*nj\ vb [ME plungen, fr. MF plonger, fr. (assumed) VL 
   plumbicare, fr.] L plumbum lead - more at PLUMB 1a: to cause to penetrate 
   or enter quickly and forcibly into : IMMERS E 1b: to sink (a potted plant) 
   in the ground or a prepared bed  2: to cause to enter a state or course of 
   action usu. suddenly, unexpected ly, or violently 1: to thrust or cast 
   oneself into or as if into water  2a: to become pitched or thrown headlong 
   or violently forward and downward  2b: to act with reckless haste : enter 
   suddenly or unexpectedly  2c: to bet or gamble heavily and recklessly  3: 
   to descend or dip suddenly 
2. plunge n : an act or instance of plunging (as a swim)