Word:

Knife-edge

Knife´-edge`
n.1.(Mech.) 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.
Knife-edge file
See Illust. of File.
Noun1.knife-edge - a narrow boundary; "he lived on a knife-edge between genius and insanity"
boundary, bounds, limit
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Knicker
Knickerbocker
Knickerbockers
knickers
Knickknack
Knickknackatory
Knickknackery
Knife
knife blade
knife edge
knife fight
Knife grass
Knife Grinder
knife pleat
Knife switch
knife thrust
-- Knife-edge --
Knife-edge file
knife-handle
Knifeboard
knifelike
Knight
Knight bachelor
Knight banneret
Knight baronet
knight errantry
Knight marshal
Knight of industry
Knight of Malta
Knight of the post
Knight of the Round Table
Knight of the shire
knight of the square flag
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