研ぐ

• Reading: とぐ
• Romaji: togu
• Kanji breakdown: 研 (to/ken) — sharpen, grind, polish, research
• Pronunciation: /to.ɡɯ/

Meaning

To sharpen; to grind; to whet; to polish; to wash (rice). A versatile verb covering the physical act of honing or cleaning by friction.

A Group 1 (godan) verb with the -ぐ ending. 研ぐ covers sharpening blades (包丁を研ぐ — to sharpen a kitchen knife), polishing surfaces, and also washing rice (米を研ぐ), where the rice grains are rubbed together to remove excess starch. The rice-washing sense is uniquely Japanese and culturally significant. The kanji 研 also appears in 研究 (research) and 研修 (training), all sharing the core idea of refinement through effort.

Examples

1. 料理の前に砥石で包丁を研いでおくと、切れ味が格段に上がる。 If you sharpen your kitchen knife on a whetstone before cooking, the cutting edge improves dramatically.
2. 母はいつも夕食前に米を丁寧に研いでいた。 My mother always carefully washed the rice before dinner.
3. 刀鍛冶は何時間もかけて刃を研ぎ上げ、鏡のような輝きを出した。 The swordsmith spent hours honing the blade to a mirror-like brilliance.

Usage Guide

Context: cooking, craftsmanship, daily life, traditional arts

Tone: neutral

Origin & History

From Old Japanese 研ぐ (togu), related to 砥 (to — whetstone). The character 研 depicts a stone used for grinding and polishing, and has been used in Japanese since the Nara period.

Cultural Context

Era: Ancient

Generation: All ages

Social background: Universal