knife-edge
noun
- the edge of a knife
- any very sharp edge
- a metal wedge whose fine edge serves as the fulcrum for a scale beam, pendulum, etc.
See knife-edge in American Heritage Dictionary 4
(nīfˈĕjˌ)
noun- A sharp cutting edge.
- A sharp, narrow edge or border: “saying lines that teeter on the knife-edge between literature and lunacy” (Vincent Canby).
- A wedge of metal used as a low-friction fulcrum for a balancing beam or lever.
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