os·si·fy /ˈɒsɪfaɪ $ ˈɑː-/ verb (ossified, ossifying) 1. [intransitiveI] formalCHANGE YOUR MIND to become unwilling to consider new ideas or change your behaviour 墨守成规;僵化 2. [intransitiveI, transitiveT] technicalHBM to change into bone or to make something change into bone (使)骨化 —ossification /ˌɒsɪfɪˈkeɪʃən $ ˌɑːs-/ noun [uncountableU]