knife edge


  1. the cutting edge of a knife.
  2. anything very sharp.
  3. a wedge on the fine edge of which a scale beam, pendulum, or the like, balances or oscillates.


  1. the sharp cutting edge of a knife
  2. any sharp edge
  3. a sharp-edged wedge of hard material on which the beam of a balance pivots or about which a pendulum is suspended
  4. a critical point in the development of a situation, process of making a decision, etc

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