Definition of plunge noun from the Oxford Advanced Learner's Dictionary

     

    plunge

     noun
    noun
    BrE BrE//plʌndʒ//
     
    ; NAmE NAmE//plʌndʒ//
     
    [usually singular] Diving
     
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  1. 1a sudden movement downwards 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. See related entries: Diving
  5. Word Origin late Middle English: from Old French plungier ‘thrust down’, based on Latin plumbum ‘lead, plummet’.Extra examples He finally took the plunge and gave in his notice. How did he survive his icy plunge? She prepared to take the plunge into the cold waters of Lake Ontario. The river takes a headlong plunge into a maelstrom of rocks and boulders. a plunge into the icy water a plunge to the ground his headlong plunge into shame and hypocrisy the economy’s downward plungeIdioms (informal) 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 American Dictionary entry: plunge