letdown

Noun

let-down (countable and uncountable, plural let-downs)

1. (countable) A disappointment or anticlimax.
   • After seeing all the advertisements, the show itself was quite a let-down.
2. The neurohormonal release of milk in dairy cows or in breastfeeding human mothers.
   • The majority of peasant farmers in the tropics allow the calf to suckle before milking in order to obtain a let-down of milk.1990, WJA Payne, An Introduction to Animal Husbandry in the Tropics
3. The clearance of an aircraft to descend through clouds to clear air below, or the process of granting such a clearance.
   • The flight received a radar letdown from air traffic control.