Longman Dictionary of Contemporary English homepage

knife-edge

noun
     
knife-edge [singular]
1 a situation in which the result is extremely uncertain
on a knife-edge
His future in the job is balanced on a knife-edge.
a knife-edge vote
2 a situation which makes someone very anxious
on a knife-edge
Living with him, she is constantly on a knife-edge.
the knife-edge of insecurity
3 something that is narrow or sharp

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