verb
descend steeply and rapidly
• Topics: ↑air travel, ↑aviation, ↑air
• Verb Frames:
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Something ——s
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Somebody ——s
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The airplane is sure to crash-dive
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\\ˈ ̷ ̷| ̷ ̷\ intransitive verb of a submarine : to submerge in the shortest possible time
: to dive into
hit by flak, the plane … rolled over … in an attempt to crash-dive the escort carrier — Time
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/krash"duyv", -duyv'/, v.i., v.t., crash-dived or crash-dove, crash-dived, crash-diving.
to dive rapidly at a steep angle.
[1925-30]
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crashˈ-diveˈ intransitive verb and transitive verb
• • •
Main Entry: ↑crash
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a sudden, very rapid dive by a submarine.
–v.i.
to make a crash dive.
–v.t.
to dive suddenly and rapidly into: »
to crash-dive an enemy boat.
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1.v. [intrans.] (of a submarine) dive rapidly and steeply to a deeper level in an emergency
■ (of an aircraft) plunge steeply downward into a crash
2.
n. crash dive a steep dive of this kind by a submarine or aircraft
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(of an aircraft) to go steeply downwards and then crash
Verb forms: 
Useful english dictionary. 2012.