2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Knife-edge \Knife"-edge`\, n. (Mech.) 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. [1913 Webster] {Knife-edge file}. See Illust. of {File}. [1913 Webster] From WordNet (r) 2.0 [wn]: knife-edge n : a narrow boundary; "he lived on a knife-edge between genius and insanity"
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