- 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
First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for knife edge
A touch of a knife-edge to the rope, and the girl would be saved.Out of the Depths
Robert Ames Bennet
Followed by another, he advanced along the knife-edge to their wounded comrade.The House of Pride
Her offered, her passive extent, in other words, was about that of a knife-edge.The Portrait of a Lady
The points of the pins serve as a knife-edge for the rocker.The Boy Mechanic, Book 2
The knife-edge is then turned forward and made to cut its way out.
- 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