nosedive

[nohz-dahyv] /ˈnoʊzˌdaɪv/
noun, Also, nose dive
1.
a plunge of an aircraft with the forward part pointing downward.
2.
a sudden sharp drop or rapid decline:
a time when market values were in a nosedive.
verb (used without object), nosedived or nosedove, nosedived, nosediving. Also, nose-dive
3.
to go into a nosedive:
a warning that prices might nosedive.
Origin
1910-15; nose + dive
British Dictionary definitions for nose dive

nose dive

noun
1.
a sudden plunge with the nose or front pointing downwards, esp of an aircraft
2.
(informal) a sudden drop or sharp decline: prices took a nose dive
verb
3.
to perform or cause to perform a nose dive
4.
(intransitive) (informal) to drop suddenly
Slang definitions & phrases for nose dive

nose dive

noun phrase

A sudden and large decrease: The price of gold took a nose dive (1920+)

verb

: Our morale nose-dived yesterday

[fr the precipitate descent of an airplane, found by 1912]