Definition of plunge in phrasal verb from the Oxford Advanced American Dictionary

 

plunge in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    plunge in

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    plunge into something

     
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  1. 1to jump into something, especially with force The pool was declared open and eager swimmers plunged in.
  2. 2to start doing something in an enthusiastic way, especially without thinking carefully about what you are doing She was about to plunge into her story when the phone rang. He's always plunging in at the deep end (= becoming involved in difficult situations without being well enough prepared).

plunge something in

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plunge something into something

 
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to push something quickly and with force into something else Bring the water to the boil and plunge the vegetables in. He plunged his sword into the giant's body.
See the Oxford Advanced Learner's Dictionary entry: plunge in