Denotation vs. Connotation

cutting edge, at the

Also, on the cutting edge. In the forefront, in a position of greatest advantage or importance. For example, In my youth I was at the cutting edge of medical research, or Our company is on the cutting edge of gene therapy. This metaphoric phrase alludes to the sharp edge of a knife or other cutting tool. [ c. 1950 ]
The American HeritageĀ® Idioms Dictionary
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