凝る， こる
1. to become stiff (of muscles)
2. to get absorbed in, to develop a passion for, to devote oneself to, to become obsessed with, to get hooked on
3. to be elaborate, to be intricate, to be exquisite, to be particular about, to pay great attention to
肌肉僵硬；精雕细琢，错综复杂，精美绝伦，讲究细节，注重细节；沉迷于，对……产生热情，全身心投入，痴迷于，上瘾于