Definitions for knife edge
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Random House Webster's College Dictionary
knife′ edge`(n.)
the cutting edge of a knife.
anything with a sharp edge.
a wedge on the fine edge of which a scale beam, pendulum, or the like, balances or oscillates.
Category: Horology
Origin of knife edge:
1810–20
knife′-edged`(adj.)
Princeton's WordNet
knife-edge(noun)
a narrow boundary
"he lived on a knife-edge between genius and insanity"
knife edge, cutting edge(noun)
the sharp cutting side of the blade of a knife
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