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  1. knife edge
  2. noun

    • 1. the edge of a knife.

    • 2. (of creases or pleats in a garment) very fine:

      knife-edge creases
    • 3. a tense or uncertain situation, especially one finely balanced between success and failure:

      they have been living on a knife edge since his libel action
    • 4. a steel wedge on which a pendulum or other device oscillates or is balanced.

    • 5. a narrow, sharp ridge; an arĂȘte.

  3. Variation

    • n.: noun: knife-edge, plural noun: knife-edges