n. 25B6; noun
the plane went into a nosedive : DIVE, descent, drop, plunge, plummet, fall.
(informal) sterling took a nosedive : FALL, drop, plunge, plummet, tumble, decline, slump; informal crash.
climb, rise.
25B6; verb
the device nosedived to earth : DIVE, plunge, pitch, drop, plummet.
(informal) costs have nosedived : FALL, take a header, drop, sink, plunge, plummet, tumble, slump, go down, decline; informal crash.
soar, rise.