Dictionary / Vocabulary / 研ぐ
とぐ
to sharpen; to hone; to whet; to grind
JLPT N1 common word Also written 磨ぐ、砥ぐ
彼はナイフを研いでいました。
He was sharpening a knife.
猫が柱でつめを研いでいた。
A cat was sharpening its claws against a post.
無洗米でもつい研いでしまう。
Even if it's pre-washed rice, I still end up washing it out of habit.