Tailspins

noun

1. The rapid, uncontrollable descent of an aircraft in a steep spiral.

   "The loss of the third engine threw the plane into a tailspin."

2. A severe mental or emotional collapse; emotional breakdown.

   "Just hours after leaving the institution, she suffered another tailspin."

3. Any sharp, sustained, often uncontrollable descent or decline.

   "The present stock tailspin proves bankruptcy is imminent."