Knife-edge

noun

Definitions

Noun
  1. 1
    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.
  2. 2
    a narrow boundary wordnet
  3. 3
    A precarious balance that could be upset by a very small force in either direction. figuratively

    "The game was on a knife-edge."

  4. 4
    Used other than figuratively or idiomatically: the edge of a knife.

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