Sharpening.
To sharpen a knife with another or on a whetstone, ⊗ en; the knife being sharpened, i ⊗; that on which it is sharpened, panğí ⊗ an.
According to some, it means to test the tool to see if it is sharp or not.
(ancient) To polish or burnish, i ⊗; he who, manğí ⊗.
See líguid.