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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI