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cutting edge, at the

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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]

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Which of the following words describes “sky blue”?
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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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