What is the meaning of solidifying?

noun

• The process of becoming hard or solid by cooling or drying or crystallization.
  • usage: "the hardening of concrete"; "he tested the set of the glue"
  • synonyms: hardening, solidification, set, curing

verb

• Make solid or more solid; cause to solidify.
  • synonyms: solidify
• Become solid.
  • usage: "The metal solidified when it cooled"
  • synonyms: solidify