definition of
[nosedive]

[1] #1 nosedive n. a sudden sharp drop or rapid decline; "the stock took a nosedive". wn

[2] #2 nosedive v. plunge nose first; drop with the nose or front first, of aircraft. wn

[3] #3 nosedive n. [dive, nose dive] a steep nose-down descent by an aircraft. wn