solidifying

(noun) the process of becoming hard or solid by cooling or drying or crystallization. Synonyms: hardening, solidification, set, curing. Examples: "The hardening of concrete." "He tested the set of the glue."

(verb) make solid or more solid; cause to solidify. Synonyms: solidify.

(verb) become solid. Synonyms: solidify. Example: "The metal solidified when it cooled."