curdle
/ˈkɜ:dl; `kədl/ v [I, Tn]
(cause sth to) form into curds （使某物）结成凝乳
The milk has curdled, ie become sour. 牛奶凝结了（变酸了）.
Lemon juice curdles milk. 柠檬汁可使牛奶结成凝乳.
(fig 比喻) a scream which was enough to curdle one's blood/make one's blood curdle, ie fill one with horror 让人心惊胆战的尖叫声.