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
Don't let it boil or it will become tough and curdled.
There was some watery fluid and milk in the rumen and curdled milk in the abomasum.
The pioneers' initial energy and excitement curdled into fatigue and crankiness after three or more months on the road.
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