different between unhinge vs crackup

English

un- +? hinge

unhinge (third-person singular simple present unhinges, present participle unhinging, simple past and past participle unhinged)

From the verb phrase crack up.

crackup (plural crackups)

A crash or wreck, generally involving a car or airplane.
- 1936, Joseph R. James, "More Gates Air Circus Antics" (Popular Aviation, November 1936)
  They shook the head of the unconscious pilot and when the latter opened his eyes, blinking wildly, the other members of the family lifted up the tail of the overturned crate sufficiently high enough to enable the dazed pilot, after releasing his belt, to fall out of the cockpit head first and disengage himself from the crack-up.

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