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knife edge

the cutting edge of a knife.
anything very sharp.
a wedge on the fine edge of which a scale beam, pendulum, or the like, balances or oscillates.
Origin of knife edge
1810-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for knife-edge
Historical Examples
  • I stooped over her in the dark of Collins's tunnel, where just a knife-edge of the cave firelight cut over the boulder's top.

    The La Chance Mine Mystery Susan Carleton Jones
  • Followed by another, he advanced along the knife-edge to their wounded comrade.

    The House of Pride Jack London
  • The points of the pins serve as a knife-edge for the rocker.

  • A touch of a knife-edge to the rope, and the girl would be saved.

    Out of the Depths Robert Ames Bennet
  • I meant another kind of knife-edge; the thin, almost invisible, line which separates sanity from non-sanity.

    The Edge of the Knife Henry Beam Piper
  • For a moment it hung on the knife-edge of the world, and then dipped down and was gone.

    Wild Folk Samuel Scoville
  • The knife-edge is then turned forward and made to cut its way out.

  • The town is balancing on the knife-edge of a panic at this moment.

  • It requires a stretch of imagination to attach the word “harrow” to these knife-edge weeders.

    Farm Mechanics Herbert A. Shearer
  • At one place it ran along the crest of a ridge that was no more than a knife-edge.

    Martin Eden Jack London
British Dictionary definitions for knife-edge

knife edge

the sharp cutting edge of a knife
any sharp edge
a sharp-edged wedge of hard material on which the beam of a balance pivots or about which a pendulum is suspended
a critical point in the development of a situation, process of making a decision, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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