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The phrase "knife edge" is correct and usable in written English.
You can use it to refer to a very narrow margin or a precarious situation where the outcome is uncertain. For example, "The election results were on a knife edge and it took days to figure out the winner."
Exact(29)
Life on a knife edge.
Palmyra is on a knife edge.
But the USA on a knife edge.
The result is on a knife edge.
It feels balanced on a knife edge.
Here's Shakespeare, standing on a knife edge.
Similar(31)
It should be a knife-edge vote.
British opinion is on a knife-edge.
We're always on this knife-edge".
Several results were on a knife-edge.
Every performance is knife-edge stuff.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com