Usually means: Sharp boundary between two choices.
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We found 24 dictionaries that define the word knife edge:

General (21 matching dictionaries)
  1. knife edge: Longman Dictionary of Contemporary English
  2. knife-edge: Merriam-Webster
  3. knife edge: Oxford Learner's Dictionaries
  4. knife-edge: American Heritage Dictionary of the English Language
  5. knife-edge, knife-edge, knife edge: Collins English Dictionary
  6. knife-edge, knife edge: Vocabulary.com
  7. knife-edge: Wordnik
  8. knife-edge: Cambridge Advanced Learner's Dictionary
  9. knife-edge, knife edge: Wiktionary
  10. knife-edge: Webster's New World College Dictionary, 4th Ed.
  11. knife edge: Infoplease Dictionary
  12. Knife-edge, knife-edge, knife edge: Dictionary.com
  13. Knife Edge (disambiguation), Knife Edge (film), Knife Edge: Wikipedia, the Free Encyclopedia
  14. Knife-edge: Online Plain Text English Dictionary
  15. knife-edge, knife edge: Rhymezone
  16. Knife-edge: AllWords.com Multi-Lingual Dictionary
  17. knife-edge, knife edge: FreeDictionary.org
  18. knife-edge, knife edge: Mnemonic Dictionary
  19. knife-edge, knife edge: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. knife-edge, knife edge: Encyclopedia

Tech (2 matching dictionaries)
  1. knife edge: Coin Collecting
  2. Knife Edge: Stay Sharp

(Note: See knife_edges as well.)

Definitions from Wiktionary (Knife edge)

noun:  Alternative form of knife-edge [A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.]

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