nosedive

[ nohz-dahyv ]
/ ˈnoʊzˌdaɪv /

noun Also nose dive.

a plunge of an aircraft with the forward part pointing downward.
a sudden sharp drop or rapid decline: a time when market values were in a nosedive.

verb (used without object), nose·dived or nose·dove, nose·dived, nose·div·ing. Also nose-dive.

to go into a nosedive: a warning that prices might nosedive.

Origin of nosedive

First recorded in 1910–15; nose + dive

British Dictionary definitions for nose dive

nose dive

noun

a sudden plunge with the nose or front pointing downwards, esp of an aircraft
informal a sudden drop or sharp decline prices took a nose dive

verb nose-dive

to perform or cause to perform a nose dive
(intr) informal to drop suddenly