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letdown

[let-doun] /ˈlɛtˌdaʊn/
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
1760-1770
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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Word Origin and History for let-down

letdown

n.

also let-down, "disappointment," 1768, from let (v.) + down (adv.). The verbal phrase is from mid-12c. in a literal sense; figuratively by 1795.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for let-down

letdown

noun
  1. A disappointment; comedown: Actually meeting him was something of a letdown (1889+)
  2. The gradual descent of an airplane toward a landing (1945+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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