Definitions from Wiktionary (let-down)

▸ noun:  (countable) A disappointment or anticlimax.
▸ noun:  (countable, uncountable) The neurohormonal release of milk in dairy cows or in breastfeeding human mothers.
▸ noun:  (aviation) The clearance of an aircraft to descend through clouds to clear air below, or the process of granting such a clearance.

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