verb (used with object), verb (used without object), curdled, curdling.
to change into curd; coagulate; congeal.
to spoil; turn sour.
to go wrong; turn bad or fail: Their friendship began to curdle as soon as they became business rivals.
curdle the/one's blood, to fill a person with horror or fear; terrify: a scream that curdled the blood.

1580–90; curd + -le

curdler, noun
noncurdling, adjective, noun
uncurdled, adjective
uncurdling, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
curdle (ˈkɜːdəl)
1.  to turn or cause to turn into curd
2.  curdle someone's blood to fill someone with fear
[C16 (crudled, past participle): from curd]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1630 (earlier crudle, 1580s), "to thicken, cause to congeal," frequentative of curd (v.) "to make into curd" (late 14c.; see curd). Of blood, in fig. sense "to inspire horror" from c.1600. Related: Curdled (1590); curdling (c.1700, almost always with ref. to blood, in the figurative sense).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Add prawn stock, followed by coconut milk, stirring all the time to prevent curdling until it comes to boil.
Also to prevent curdling, do not allow the mixture to boil.
Many things can go wrong: curdling latex, dust in the mix, chemistry errors.
The paint shall show no curdling, livering, caking lumps or skins upon opening of container.
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