knife-edge

名词 n.
中文释义

英文释义

名词 n.
  1. A small piece of metal, usually steel, sharpened to an acute edge or angle, and resting on a smooth surface, serving as the fulcrum of a pendulum, scalebeam, or other piece required to oscillate with minimal friction.
    — Again, as the pendulum was provided with sharp knife-edges on opposite sides near its upper end, shaped like a V, on which it swung, the greater the weight of the pendulum the more wear there would be on these knife-edges.
  2. A precarious balance that could be upset by a very small force in either direction. figuratively
    — The game was on a knife-edge.
  3. Used other than figuratively or idiomatically: the edge of a knife.

词形变化

knife-edges plural knife edge alternative knife's edge alternative knife's-edge alternative

词汇关系

衍生词
knife-edge file knife-edge effect
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