- the cutting edge of a knife.
- anything very sharp.
- a wedge on the fine edge of which a scale beam, pendulum, or the like, balances or oscillates.
- the sharp cutting edge of a knife
- any sharp edge
- a sharp-edged wedge of hard material on which the beam of a balance pivots or about which a pendulum is suspended
- a critical point in the development of a situation, process of making a decision, etc