Sudden downturn (8)
I believe the answer is:
nosedive
(Other definitions for nosedive that I've seen before include "(Make a) steep downward plunge" , "steep fall" , "headlong plunge" , "Dramatic fall" , "drop sharply" .)
I believe the answer is:
nosedive
(Other definitions for nosedive that I've seen before include "(Make a) steep downward plunge" , "steep fall" , "headlong plunge" , "Dramatic fall" , "drop sharply" .)