• 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.


    Knife-edge meaning & definition 1 of Knife-edge.


  • in a difficult or worrying situation of which the result is very uncertain:

    Knife-edge meaning & definition 2 of Knife-edge.

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