nosedive

From nose +‎ dive.

• IPA^(key): /ˈnəʊzdaɪv/

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nosedive (plural nosedives)

1. A headfirst fall or jump.
2. (aviation) A drop in altitude with the nose of the craft angled downwards.
3. (economics, etc.) A rapid fall, e.g. in price or value.
   • 2022 April 6, Howard Johnston, “SRA: Lets not make the same mistakes with GBR”, in RAIL, number 954, page 34:

     Byers was frequently at odds with Rail Regulator Sir Tom Winsor, but quit after 11 months - his career took a nosedive when he admitted false claims for £125,000 expenses, and he was banned from the House of Commons for two years.

nosedive (third-person singular simple present nosedives, present participle nosediving, simple past nosedived or nosedove, past participle nosedived)

1. (intransitive, of aircraft) To dive down in a steep angle.
2. (intransitive, economy) To perform a rapid fall in price or value.
   • 2020 July 29, Paul Stephen, “A new collaboration centred on New Street”, in Rail, page 56:

     With punctuality nosediving and both overcrowding and cancellations on the rise, a new simplified timetable was introduced in December amid threats from the Mayor that he would ask the Secretary of State for Transport to strip Abellio of the franchise.

• crash dive
• power dive

• “nosedive”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.