a sweet food made from milk or cream with other things such as sugar, lemon, or wine added to it

For dessert we had lemon posset. 饭后甜食我们吃了柠檬味的牛奶甜酒。

a small amount of milk that comes back out of a baby's mouth after the baby has swallowed it

If a baby possets, a small amount of milk comes back out of his or her mouth after it has been swallowed.

Breast-fed babies tend to posset less. 母乳喂养的婴儿比较少漾奶。