"Letdown" refers to the feeling of disappointment or disillusionment that occurs when expectations are not met. This can happen in various situations, such as after a highly anticipated event, a movie, or a personal achievement. The emotional response often includes feelings of sadness or frustration, as the outcome does not align with what was hoped for. In a different context, "letdown" can also describe a physical response in breastfeeding. It refers to the moment when milk is released from the breast in response to a baby's suckling. This reflex is crucial for feeding and can be influenced by factors such as stress or relaxation.