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knife-edge
WIKTIONARY
knife-edge
Noun
  • 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.
  • A precarious balance that could be upset by a very small force in either direction. figuratively
  • Used other than as an idiom: the edge of a knife.