New Word Suggestion. Taking a risk above and beyond what most people would do. Pushing your horizons be it physical, mental or otherwise. This is a common trait among dare-devils and over-the-top sports enthusiasts.
Simply so, is it at the edge or on the edge?
When you are at the edge of something, you can see over it, but when you are on the edge, you are more likely to fall off. People also use the phrase “on edge” when they mean anxious or nervous—on the edge of going out of control.
: very close to (something) a species on the edge of extinction The company was teetering on the edge of disaster/bankruptcy. He was on the edge of saying something when the phone rang.