The crossword solutions for the term 'Harden, in a way' are 'ENCRUST' (7 letters) and 'OSSIFY' (6 letters). ENCRUST is a verb meaning to cover something with a hard layer of material, such as a crust of ice or a coating of paint. OSSIFY is a verb meaning to turn into bone or to become rigid and inflexible. Both terms can be used to describe the process of hardening, either through the addition of a hard layer or through the process of becoming rigid.