verb (used with or without object), cur·dled, cur·dling.
Origin of curdle
Examples from the Web for curdle
No matter what the subject, he came up with a sound bite that could curdle milk.
And though topical humor tends to be transitory, a really bad gag can take on a life of its own and curdle a political career.
Stir soup over fire a few minutes to reheat; but be careful that it does not boil, or it will curdle.The Story of Crisco|Marion Harris Neil
It must not be added to the eggs in a boiling state or else they will curdle.Cassell's Vegetarian Cookery|A. G. Payne
Stir until the mixture thickens, being careful it does not curdle.The Skilful Cook|Mary Harrison
Whip up the eggs, stir carefully into them the hot milk, so as not to curdle the eggs.The Allinson Vegetarian Cookery Book|Thomas R. Allinson
Yolk of egg is often used in fricassee, cream is better, as the former is apt to curdle.
Word Origin for curdle
1630s (earlier crudle, 1580s), "to thicken, cause to congeal," frequentative of curd (v.) "to make into curd" (late 14c.; see curd). Of blood, in figurative sense "to inspire horror" from c.1600. Related: Curdled (1590); curdling (c.1700, almost always with reference to blood, in the figurative sense).