The phrase "a sharp line of" is correct and usable in written English.
It can be used to describe a clear or distinct boundary, division, or characteristic in various contexts, such as art, design, or metaphorical situations.
Example: "The artist created a sharp line of contrast between the dark and light colors in the painting."
Alternatives: "a clear boundary of" or "a distinct edge of".
As the Middle Ages lead into the Renaissance, the influence of folk literature on the work of writers increases in importance, so that it is sometimes difficult to draw a sharp line of distinction between them.
Now that it seems likely a comet has drawn a sharp line of charcoal between the two cultures, careful measurements should be able to show whether North America was, for a few centuries after the impact, as bereft of people as it has since been of mammoths.
That idea lost steam after the National Academy of Sciences suggested that there was a sharp line of demarcation worth preserving, with NASA supporting astronomy from space, the realm it knows best, and the science foundation financing ground-based astronomy, the realm it knows best.
Science communicators and educators need to refrain from phraseology which connotes a sharp line of demarcation between nonliving and living or the existence of a discrete moment in time at which life appeared.
Intelligent design theory may be regarded as a resurgence of the vitalist mindset in that it too posits a sharp line of demarcation between living and nonliving via its "irreducible complexity" clause.
As long as life remains viewed as a discrete state, intuitive logic will continue to demand both a sharp line of demarcation between it and nonlife, and a definitive point of transition from one to the other locatable in precise time.
For Perriello, going after Wall Street was not just a matter of conviction; it was the politics of survival, allowing him to draw a sharp line between the interests of the working people of his district and the interests of the Republicans they usually elected.
Even with the presence of the context of situation, drawing a sharp line between sentence elements in terms of the degree of CD they carry may be inaccurate as it differs from one interpretation to another.
Seeking to draw a sharp line between his view of international relations and those of his predecessors in the Oval Office, Trump stressed that diverse nations had the right to their own "values" and "culture" without the interference of outsiders.
Tönnies marked a sharp line between the realm of concepts and the reality of social action: the first must be treated axiomatically and in a deductive way ("pure sociology"), whereas the second empirically and inductively ("applied sociology").
In addition to embracing bin Laden's strategy, ISIS leader Abu Bakr al Baghdadi is seeking to draw a sharp line between the world of Islam and the world of the unbelievers, and to convince Muslims that they can never be accepted as practicing Muslims living in the West.
