研みがく
Meanings
Verb (5-dan, く, transitive)
1. to polish; to shine; to burnish; to scour; to scrub; to brush (teeth); to grind (e.g. a lens)
I polished that part carefully too.
2. to refine (a skill, etc.); to improve; to hone; to polish (up); to cultivate (one's character)
Actually, this technique was something I had been secretly honing for several days.
Kanji used
refine
Pitch accent
み
がく