knife-edge (English, noun)
expansion: knife-edge (plural knife-edges)
Senses:
glosses: A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.
glosses: A precarious balance that could be upset by a very small force in either direction.
tags: figuratively
glosses: Used other than figuratively or idiomatically: the edge of a knife.
Forms:
form: knife-edges
tags: plural
form: knife edge
tags: alternative
form: knife's edge
tags: alternative
form: knife's-edge
tags: alternative