knife-edge


Concise Oxford English Dictionary © 2008 Oxford University Press:
knife-edge
noun
  • 1 the cutting edge of a knife.

    ■ [as modifier] (of creases or pleats) very fine.

  • 2 a very tense or dangerous situation.
  • 3 a steep mountain ridge; an arête.
  • 4 a steel wedge on which a pendulum or other device oscillates or is balanced.
'knife-edge' also found in these Oxford entries:

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