Crossword Genius

Unstoppable rapid decline (4,4)

Ross

I believe the answer is:

free fall

(Other definitions for free fall that I've seen before include "Rapid descent (before chute opens)" , "Rapid descent (before parachute opens, for example)" , "Motion under gravity" , "Unchecked descent" , "Drop with parachute unopened" .)

I've seen this clue in The Guardian.
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