It's actually a harder question to answer than it looks. I suppose for me it's a feeling to drop off the world, probably contains if I can sort of describe it, a lot of self-doubt, constricted thinking, avoidance, mistrust, maybe some self-sabotage, & self-loathing, followed by numbness, sadness or disinterest in others, fear reduction. It is a sort of throwing-things-away, or feeling it's required or best to.