Definition of knife edge noun from the Oxford Advanced American Dictionary

 

knife edge

 noun
noun
 
[usually singular]
 
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  • the sharp edge of a knife
  • Idioms
      on a knife edge
       
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    1. 1(of a situation, etc.) finely balanced between success and failure The economy is balanced on a knife edge.
    2. 2(of a person) very worried or anxious about the result of something He's living on a knife edge, waiting for the test results.
    See the Oxford Advanced Learner's Dictionary entry: knife edge