Sharpening kitchen knives is done carefully using a whetstone.
Since the things to be sharpened have piled up, let's sharpen them all today.
knife grinder; sword sharpener; polisher
Standard kanji spelling for this noun.
Abbreviated kanji form; less common than 研ぎ物.
Compound of 研ぎ (continuative form of 研ぐ 'to sharpen') + 物 ('thing'). The derivation is transparent, but the word itself is rare.