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knife–edge

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knife–edge/ˈnaɪfˌɛʤ/noun
knife–edge
/ˈnaɪfˌɛʤ/
noun
Learner's 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
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