verb (used with object), unwound, unwinding.
to undo or loosen from or as if from a coiled condition: to unwind a rolled bandage; to unwind a coiled rope.
to reduce the tension of; relax: to unwind a person with a drink.
to disentangle or disengage; untwist: to unwind one's legs from around the stool.
verb (used without object), unwound, unwinding.
to become unwound.
to become relieved of tension; relax: After work we can have a drink and unwind.

1275–1325; Middle English onwinden; see un-2, wind2

unwindable, adjective
unwinder, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unwind (ʌnˈwaɪnd)
vb , -winds, -winding, -wound
1.  to slacken, undo, or unravel or cause to slacken, undo, or unravel
2.  (tr) to disentangle
3.  to make or become relaxed: he finds it hard to unwind after a busy day at work

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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Word Origin & History

early 14c., "to undo" (a bandage, wrapping, etc.), from un- (2) + wind (v.). Cf. O.E. unwindan, Du. ontwinden, O.H.G. intwindan. Refl. sense is recorded from 1740; figurative sense of "to release oneself from tensions, to relax" is recorded from 1938.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Calming, orderly, serviceable entries allow you to unwind and relax.
Then, after you land, check in and go somewhere to relax and unwind and revel
  in your new surroundings for a bit.
Adults-only zones and flexible dining options offer parents a chance to unwind
  and relax.
On your way there you will have four days to relax and unwind from all the
  stress of life.
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