"nosedives" in the noun sense
1. nosedive
a sudden sharp drop or rapid decline
"the stock took a nosedive"
2. dive, nose dive, nosedive
a steep nose-down descent by an aircraft
"nosedives" in the verb sense
1. nosedive
plunge nose first drop with the nose or front first, of aircraft
Source: WordNet® (An amazing lexical database of English)
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