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1. A sharp cutting edge.
2. A sharp, narrow edge or border: "saying lines that teeter on the knife-edge between literature and lunacy" (Vincent Canby).
3. A wedge of metal used as a low-friction fulcrum for a balancing beam or lever.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||knife-edge - a narrow boundary; "he lived on a knife-edge between genius and insanity"|
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