Definition of plunge verb from the Oxford Advanced American Dictionary

     

    plunge

     verb
    verb
    NAmE//plʌndʒ//
     
    Verb Forms present simple I / you / we / they plunge
     
    he / she / it plunges
     
    past simple plunged
     
    -ing form plunging
     
     
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  1. 1[intransitive, transitive] to move or make someone or something move suddenly forward and/or downward + adv./prep. She lost her balance and plunged 100 feet to her death. The train left the track and plunged down the embankment. plunge somebody/something + adv./prep. The earthquake plunged entire towns over the edge of the cliffs.
  2. 2[intransitive] (of prices, temperatures, etc.) to decrease suddenly and quickly synonym plummet Stock markets plunged at the news of the coup. This year profits plunged by 40%.
  3. 3[intransitive] + adv./prep. (of a road, surface, etc.) to slope down steeply The track plunged down into the valley.
  4. 4[intransitive] to move up and down suddenly and violently The horse plunged and reared. (figurative) His heart plunged (= because of a strong emotion).
  5. Phrasal Verbsplunge inplunge something inplunge into somethingplunge somebody/something into something
See the Oxford Advanced Learner's Dictionary entry: plunge