tailspin
noun
Definitions
The rapid, uncontrollable descent of an aircraft in a steep spiral.
Example: The loss of the third engine threw the plane into a tailspin.
A severe mental or emotional collapse; emotional breakdown.
Example: Just hours after leaving the institution, she suffered another tailspin.
Any sharp, sustained, often uncontrollable descent or decline.
Example: The present stock tailspin proves bankruptcy is imminent.
verb
Definitions
Of an aircraft: to go into a rapid, uncontrollable descent in a steep spiral.
To go into a sharp, sustained, often uncontrollable descent or decline.