noun Informal.
cessation; pause; relief.

1835–45, Americanism; noun use of verb phrase let up

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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To letup

a pause during which things are calm or activities are diminished; "there was never a letup in the noise" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
There will also be no letup in the demands of society that businesses behave
Meanwhile, there can be no letup by the rest of the world's negotiators, no
  matter how tired and beat up they may be.
It felt and sounded as if a thousand had come at them at once, from close range
  and continuing without letup.
Throughout the hot morning the fight continued without letup.
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