Knife-edge meaning

nīfĕj
A sharp cutting edge.
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A sharp, narrow edge or border.
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A wedge of metal used as a low-friction fulcrum for a balancing beam or lever.
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The edge of a knife.
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Any very sharp edge.
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A metal wedge whose fine edge serves as the fulcrum for a scale beam, pendulum, etc.
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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.
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(figuratively) A precarious balance that could be upset by a very small force in either direction.
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Used other than as an idiom: the edge of a knife.
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