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plummet

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verb [intransitive] British English pronunciation: plummet /ˈplʌmɪt/ 
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present tense
I/you/we/theyplummet
he/she/itplummets
present participleplummeting
past tenseplummeted
past participleplummeted
  1. 2
    if something such as an amount, rate, or value plummets, it suddenly becomes much lower

    Share prices plummeted today to a three-month low.

    The president's popularity has plummeted since the war began.

    See also  crash, nosedive

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