knife-edge (suomeksi)

Määritelmät:

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.
(lb, en, figuratively) A precarious balance that could be upset by a very small force in either direction.
(&lit, the edge of a knife, lang=en)