ossify 
(…を)骨化する、(…を)硬直化する
1.to become rigid or inflexible in habits, attitudes, opinions, etc.: a young man who began to ossify right after college.
2.to convert into or cause to harden like bone.
3.to become bone or harden like bone.
Citations for ossify
If the world changes and we don't, then we become of no use to the world. Our principles cease being principles and just ossify into dogma.
おっせふぁ～い
↑
骨
↓
はかなきものとみるか硬きものとみるか
おっせふぁいの骨は生骨なんだろうなあ
骨博士であだなはそのままボーンズ。
硬きものの象徴の意か。