de·com·press

[dee-kuhm-pres]
verb (used with object)
1.
to cause to undergo decompression.
verb (used without object)
2.
to undergo decompression.
3.
Informal. to relax; unwind.

Origin:
1900–05; translation of French décomprimer. See de-, compress

de·com·pres·sive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
decompress (ˌdiːkəmˈprɛs) [Click for IPA pronunciation guide]
 
vb
1.  to relieve (a substance) of pressure or (of a substance) to be relieved of pressure
2.  to return (a diver, caisson worker, etc) to a condition of normal atmospheric pressure gradually from a condition of increased pressure or (of a diver, etc) to be returned to such a condition
 
decom'pression
 
n
 
decom'pressive
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Decompress is one of our favorite verbs.
So is lollygag. Does it mean:
to run away hurriedly; flee.
to spend time idly; loaf.
Etymonline
Word Origin & History

decompress
1905, from de- + compress.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

decompress definition

compression, data
To reverse the effects of data compression.
(2001-01-30)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Decompress in your room with such amenities as a microwave oven, refrigerator, and cable television.
It is wonderful to venture to the quiet rugged side of the island and
  decompress.
Even beyond the filming, it took another month to decompress.
They argued that the cause might be stresses set up by the earthquake rupture
  that act to decompress a magma chamber.
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