nosedive - definition and synonyms

verb [intransitive] 

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/ˈnəʊzˌdaɪv/
present tense
I/you/we/theynosedive
he/she/itnosedives
present participlenosediving
past tensenosedived
past participlenosedived
  1. 1
    if an amount or value nosedives, it suddenly becomes much lower
  2. 2
    if something nosedives, it suddenly becomes a lot less successful