knife-edgeRate this phrase:(0.00 / 0 votes)Say it
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.

Additional definitions for 'knife-edge':

knife-edgeA precarious balance that could be upset by a very small force in either direction.
knife-edgeUsed other than as an idiom: the edge of a knife.
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"knife-edge." Phrases.net. STANDS4 LLC, 2017. Web. 20 Nov. 2017. <http://www.phrases.net/phrase/knife-edge_13380>.

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