Answer: ossify

AnswerCrossword Clue
OSSIFYBecome callous.
ossifyto become rigid or inflexible in habits, attitudes, opinions, etc.
ossifyto convert into bone
ossifyto convert into bone
OSSIFYBecome rigid and inflexible
OSSIFYBecome hardened
OSSIFYBecome fixed
OSSIFYBecome hindbound
OSSIFYMake rigid.
OSSIFYHarden.
OSSIFYBecome callous or set.
OSSIFYHarden
OSSIFYBecome inflexible
OSSIFYHarden, in a way
OSSIFYTurn to bone
OSSIFYGet set in one's ways
OSSIFYBecome bony
OSSIFYBone up?
OSSIFYBecome rigid
OSSIFYHarden into bone
OSSIFYTurn into bone
OSSIFYBecome bone-hard