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1. Oxford American Dictionary

   knife edge

   • n.
     the edge of a knife.；(of creases or pleats in a garment) very fine

   • noun: knife-edge, plural noun: knife-edges

2. • 釋義

   n.

   名詞

   • 1. the edge of a knife.
   • ▪ (of creases or pleats in a garment) very fine knife-edge creases
   • ▪ a tense or uncertain situation, especially one finely balanced between success and failure they have been living on a knife edge since his libel action
   • ▪ a steel wedge on which a pendulum or other device oscillates or is balanced.
   • ▪ a narrow, sharp ridge; an arête.