let·down

[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. 2013.
Cite This Source Link To letdown
00:10
Letdown is always a great word to know.
So is elastic modulus. Does it mean:
coefficients expressing ratio of stress applied to body to resulting strain in the body
force exerted by stretched or compressed spring, which restores it to resting length
Etymonline
Word Origin & History

letdown
"disappointment," 1768, from let (v.) + down (adv.).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Their romance fails to move past physical attraction, and that's more than a
  disappointment-it's a crippling letdown.
There is no letdown in quality or range of experience, as you will see.
Even when tenure is not traumatic, there can be a significant post-tenure
  letdown.
It's a letdown when their first building doesn't herald a new voice.
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