to change from a soft or fluid state to a rigid or solid state, as by cooling or freezing

The fat congealed on the top of the soup.

to curdle; coagulate, as a fluid.

to make or become fixed, as ideas, sentiments, or principles

Some philosophic systems lost their vitality and congealed.

verb

dissolve , liquify , melt , separate , thin

verb

cake , clabber , clot , concrete , condense , curdle , dry , freeze , gel , gelate , gelatinate , gelatinize , glob up , harden , indurate , jell , jellify , jelly , refrigerate , set , solidify , stiffen , thicken , petrify , coagulate