Also found in: Dictionary, Idioms.
the transport of milk from the alveoli of the breast to the ducts; called also milk let-down.
A physiologic reflex in lactating females, activated usually in response to sucking or crying by an infant, in which milk previously secreted into the alveoli of the breasts is released into the ducts that lead to the nipple.
a sensation in the breasts of lactating women that often occurs as the milk flows into the ducts. It may occur when the infant begins to suck or when the mother hears the baby cry or even thinks of nursing the child.