1) Aerobatic manoeuvre 2) Agitation 3) Critical downturn 4) Dangerous dive 5) Dizzying dive 6) Downward spiral 7) Dramatic downturn 8) Emotional collapse 9) Emotional upheaval 10) Precipitous downturn 11) Spiraling air maneuver 12) Sudden collapse 13) Sudden collapse into failure 14) Sudden decline 1) Spiral 
[n] - loss of emotional control often resulting in emotional collapse 2. [n] - rapid descent of an aircraft in a steep spiral spin
noun rapid descent of an aircraft in a steep spiral