death spiral
Noun
Meaning
(aviation) The downward, corkscrew-motion of a disabled aircraft which is unrecoverably headed for a crash.
Synonym: graveyard spiral
(figuratively, by extension) The situation or course of action of one who is on a path toward some sort of inevitable catastrophic failure.
Source: en.wiktionary.orgExamples
The American mainstream news media have so far steered well clear of the subject because the phenomenon has been enthusiastically embraced by the talk radio fringe, leading to a death spiral of diminishing credibility.
Is the Collegiate Death Spiral Coming Soon?