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knife edge

 - 1 dictionary result

knife edge

–noun
1. the cutting edge of a knife.
2. anything very sharp.
3. a wedge on the fine edge of which a scale beam, pendulum, or the like, balances or oscillates.

Origin:
1810–20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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