Oxford Dictionary English

    nosedive

    verb
    verb
    BrE BrE//ˈnəʊzdaɪv//
    ; NAmE NAmE//ˈnoʊzdaɪv//
    Verb Forms present simple I / you / we / they nosedive
    BrE BrE//ˈnəʊzdaɪv//
    ; NAmE NAmE//ˈnoʊzdaɪv//
     he / she / it nosedives
    BrE BrE//ˈnəʊzdaɪvz//
    ; NAmE NAmE//ˈnoʊzdaɪvz//
     past simple nosedived
    BrE BrE//ˈnəʊzdaɪvd//
    ; NAmE NAmE//ˈnoʊzdaɪvd//
     past participle nosedived
    BrE BrE//ˈnəʊzdaɪvd//
    ; NAmE NAmE//ˈnoʊzdaɪvd//
     -ing form nosediving
    BrE BrE//ˈnəʊzdaɪvɪŋ//
    ; NAmE NAmE//ˈnoʊzdaɪvɪŋ//
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  1. 1[intransitive] (of prices, costs, etc.) to fall suddenly synonym plummet Building costs have nosedived. During that period the quality of British film-making nosedived.
  2. 2[intransitive] (of an aircraft) to fall suddenly with the front part pointing towards the ground
See nosedive in the Oxford Advanced American Dictionary
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