Definition of congealing:
(v) :
(transitive) To change from a liquid to solid state, perhaps due to cold; called to freeze in nontechnical usage.
(v) :
(intransitive) To become congealed, solidify.
(v) :
(transitive) To coagulate, make curdled or semi-solid such as gel or jelly.
(v) :
(transitive) To make rigid or immobile.