Usage patterns
刃を研ぐto sharpen a blade
I sharpened the kitchen knife's blade.
〈物〉の刃が折れるfor a plug's prong to break
The prong of the old plug ended up breaking.
刃が欠けるfor a blade to chip
When I cut into the stone, the blade chipped.
刃を向けるto point a blade at someone; to turn against someone
He pointed the blade of the knife at the other person.
