- the edge of a knife.；(of creases or pleats in a garment) very narrow or sharp.
noun: knife-edge, plural noun: knife-edges
- 1. the edge of a knife.
- ▪ (of creases or pleats in a garment) very narrow or sharp.
- 2. a very tense or dangerous situation worried investors could be living on a knife-edge for the next twelve months
- 3. a sharp mountain ridge; an arête.
- 4. a steel wedge on which a pendulum or other device oscillates or is balanced.