nose-dive

nosedive

[nohz-dahyv]
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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
nosedive

noun
1. a sudden sharp drop or rapid decline; "the stock took a nosedive" 
2. a steep nose-down descent by an aircraft [syn: dive

verb
1. plunge nose first; drop with the nose or front first, of aircraft 
WordNet® 3.0, © 2006 by Princeton University.
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