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nose–dive

nose–dive /ˈnoʊzˌdaɪv/ verb
nose–dives; nose–dived; nose–diving
nose–dive
/ˈnoʊzˌdaɪv/
verb
nose–dives; nose–dived; nose–diving
Britannica Dictionary definition of NOSE–DIVE
[no object]
somewhat informal : to drop suddenly or sharply
of an aircraft : to drop suddenly with the front end pointing toward the ground