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knife edge

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noun

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.

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Origin of knife edge

First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for knife edge

knife edge

noun

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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