Use 'spiral down' to describe worsening situations, implying it could continue without change. The team's performance spiraled down after the loss of their coach.
Pro Tip 2/3
Emotional Impact
Highlights the emotional gravity when used in personal contexts, such as regarding morale or mental health. He spiraled down into sadness after the breakup.
Pro Tip 3/3
Urgency
Suggests a situation is urgent and requires immediate attention to prevent further decline. Without new investors, our company will spiral down.