CURDLE, verb intransitive [sometimes written crudle. See Curd.]

1. To coagulate or concrete; to thicken, or change into curd. Milk curdles by a mixture of runnet.

2. To thicken; to congeal; as, the blood curdles in the veins.

CURDLE, verb transitive

1. To change into curd; to cause to thicken, coagulate, or concrete. Runnet or brandy curdles milk.

At Florence they curdle their milk with artichoke flowers.

2. To congeal or thicken. The recital curdled my blood.