Definition of plunge noun from the Oxford Advanced American Dictionary

     

    plunge

     noun
    noun
    NAmE//plʌndʒ//
     
    [usually singular]
     
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  1. 1a sudden movement downward or away from something synonym drop The calm water ends there and the river begins a headlong plunge.
  2. 2plunge (in something) a sudden decrease in an amount or the value of something synonym drop a dramatic plunge in profits a sharp plunge in the stock markets This increase reversed an earlier price plunge.
  3. 3plunge into something the act of becoming involved in a situation or activity The company is planning a deeper plunge into the commercial market.
  4. 4an act of jumping or diving into water; a quick swim He took the plunge into the deep end. She went for a plunge.
  5. Idioms
    take the plunge(informal)
     
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    to decide to do something important or difficult, especially after thinking about it for a long time They finally decided to take the plunge and get married.
See the Oxford Advanced Learner's Dictionary entry: plunge