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. (figuratively) A precarious balance that could be upset by a very small force in either direction.
  3. Used other than with a figurative or idiomatic meaning: see the edge of a knife

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