こだわる

こだわる · kodawaru · JLPT N1 · verb-godan

to be particular about

🧂 拘 = hold tight, restrain: you grip every detail and won't let it go

拘 means to restrain or hold fast, as in 拘束 (restraint). Someone who こだわる holds tightly to how things must be done, so nothing gets loosened.