knife-edge

1. A small piece of metal, usually steel, sharpened to an acute edge or angle, and resting on a smooth surface, serving as the fulcrum of a pendulum, scalebeam, or other piece required to oscillate with minimal friction.

2. (figuratively)A precarious balance that could be upset by a very small force in either direction.

   The game was on a knife-edge.

   Messers Schneide

   ле́звие ножа́lézvije nožá

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

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• knife's edgealternative
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