When things curdle, they turn from liquid gradually to solid, forming clumps along the way. If you leave milk out of the refrigerator long enough, it will curdle.

When a liquid curdles, it forms curds, or lumpy solid masses. In some cases this is deliberate, as when you make cheese or tofu. Other times, you might accidentally let something curdle, like a custard or sauce, or a forgotten container of cream at the back of your refrigerator. Curdle was originally crudle, from crud (later curd), "any coagulated substance," or "congeal."

Definitions of curdle

v go bad or sour

“The milk curdled
Type of:
go bad, spoil
become unfit for consumption or use

v turn from a liquid to a solid mass

“his blood curdled
Type of:
clot, coagulate
change from a liquid to a thickened or solid state

v turn into curds

curdled milk”
clabber, clot
homogenise, homogenize
become homogeneous or similar, as by mixing
homogenise, homogenize
break up the fat globules of
homogenise, homogenize
cause to become equal or homogeneous as by mixing
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Type of:
change state, turn
undergo a transformation or a change of position or action

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