letdown

[let-doun]
noun
1.
a decrease in volume, force, energy, etc.: a letdown in sales; a general letdown of social barriers.
2.
disillusionment, discouragement, or disappointment: The job was a letdown.
3.
depression; deflation: He felt a terrible letdown at the end of the play.
4.
the accelerated movement of milk into the mammary glands of lactating mammals upon stimulation, as by massage or suckling.
5.
Aeronautics. the descent of an aircraft from a higher to a lower altitude preparatory to making an approach and landing or to making a target run or the like.
Also, let-down.


Origin:
1760–70; noun use of verb phrase let down

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

letdown
"disappointment," 1768, from let (v.) + down (adv.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Their romance fails to move past physical attraction, and that's more than a
  disappointment-it's a crippling letdown.
Even when tenure is not traumatic, there can be a significant post-tenure
  letdown.
Despite the initial letdown, the book was incredibly helpful.
And later it was such a letdown when their results proved to be bogus.
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