| knife edge | |
| —n | |
| 1. | the sharp cutting edge of a knife |
| 2. | any sharp edge |
| 3. | a sharp-edged wedge of hard material on which the beam of a balance pivots or about which a pendulum is suspended |
| 4. | a critical point in the development of a situation, process of making a decision, etc |
| a scrap or morsel of food left at a meal. |
| a fool or simpleton; ninny. |