Pronunciation: (nōz'dīv"), [key]
—n., v., -dived or -dove, -dived, -div•ing.
—n. 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.
to go into a nosedive: a warning that prices might nosedive.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.