ON THE CUTTING EDGE.

You might say, “My work is on the cutting edge.” Or maybe you would boast, “I like to be on the cutting edge," or "I live on the cutting edge.”

Sorry about the first: your work’s being shredded? And the second? OUCH!
That must hurt! I hope you aren’t sitting on that cutting edge.

My point is a simple one. The people who created the idiom, “the cutting edge,” may have had something in mind, a metaphor perhaps about getting things done? It’s easier to cut the cheese with the cutting edge instead of the flat edge.” But the people who use the idiom to describe their work or thinking or research are not to be trusted: they don’t make sense. And those who “live on the cutting edge” must be (a) in great pain, and (b) utter idiots.