From Longman Dictionary of Contemporary Englishcurdlecur‧dle /ˈkɜːdl $ ˈkɜːrdl/ verb [intransitive, transitive] 1 DFto become thicker or form curd, or to make a liquid do this Milk may curdle in warm weather.2 → make your blood curdle → bloodcurdling→ See Verb table
Examples from the Corpus
curdle• Do not let the sauce boil or it will curdle.• Again, it's vital not to overheat the liquid because it will curdle as well as lose its taste.• The Comanche liked to kill young buffalo calves and eat the curdled, partially digested milk from the stomach.• When heated, sour cream will curdle quickly.Origin curdle (1500-1600) curd 