noun, verb, -dived or -dove, -dived, -div⋅ing.| 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. |
| 3. | to go into a nosedive: a warning that prices might nosedive. |
nosedive
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