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knife–edge

1 ENTRIES FOUND:
knife–edge /ˈnaɪfˌɛʤ/ noun
knife–edge
/ˈnaɪfˌɛʤ/
noun
Britannica Dictionary definition of KNIFE–EDGE
[singular]
: something that is very narrow or sharp

on a/the knife-edge

: in a dangerous or important situation in which two very different results are possible