Cutting edge

At the forefront of innovation or development; featuring the most advanced or newest ideas, methods, or technology.

This phrase evolved from the literal cutting edge of tools and weapons, where the sharpest, most effective edge was crucial for performance. The metaphorical use began in the early 20th century, suggesting that like a sharp blade cuts through material, advanced ideas or technologies cut through old limitations. It gained particular prominence in the 1960s-80s during rapid technological advancement.