/ ˈkɜːdl; NAmE ˈkɜːrdl/ verb [ v , vn ]
1.
when a liquid, especially milk, curdles or sth curdles it, it separates into solid and liquid parts
2.
if sth curdles your blood or makes your blood curdle , it makes you extremely frightened or shocked
—see also blood-curdling
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WORD ORIGIN
late 16th cent.: frequentative of obsolete curd congeal .