研みがこ

みがこ · migako

JLPT N5 verb 意志推量形

研こ is the volitional form of 研く — to polish, to shine, to burnish, to scour, to scrub, to brush (teeth), to grind (e.g. a lens).

to refine (a skill, etc.), to improve, to hone, to polish (up), to cultivate (one's character)

Full entry for 研ぐ

How it’s built

研く研こ

Volitional form (意志推量形). “Let’s …” or “I’ll …”: 書こう (let’s write). With とする it means “try to”.

研く is a godan verb (u-verb), so it follows that pattern.