congeal

Short definition from Wiktionary

Verb

1. 1
   To change from a liquid to solid state, perhaps due to cold; called to freeze in nontechnical usage.
2. 2
   To coagulate, make curdled or semi-solid such as gel or jelly.
3. 3
   To make rigid or immobile.
4. 4
   To become congealed, solidify.