This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To reverse the winding or twisting of: unwind a ball of yarn.

v. To separate the tangled parts of; disentangle.

v. To free (someone) of nervous tension or pent-up energy.

verb-intransitive. To become unwound.

verb-intransitive. To become free of nervous tension; relax: liked to unwind with a cocktail before dinner.

v. To wind off; to loose or separate; to untwist; to untwine; as, to unwind thread, to unwind a ball of yarn

v. To disentangle

v. To relax; to chill out; as, to rest and relieve of stress

v. To be or become unwound; to be capable of being unwound or untwisted.

v. To wind off; to loose or separate, as what or convolved; to untwist; to untwine.

v. To disentangle.

verb-intransitive. To be or become unwound; to be capable of being unwound or untwisted.

To wind off; loose or separate, as what is wound or convolved; set free or loose: as, to unwind thread or a ball.

To disentangle; free from entanglement.

To admit of being unwound; become unwound: as, a skein that unwinds easily.

v. become less tense, rest, or take one's ease

v. cause to feel relaxed

v. reverse the winding or twisting of

v. separate the tangles of

"(I believe the currently preferred Wall Street term is 'unwind' -- as in 'unwind the subprime mortgage mess'.)"

coil   

unwinded    unwinding    unwinds    unwound   

displace    move   

unwound   

untwist    untwine    disentangle    uncoil    reel    unreel    ravel   

affined    aligned    assigned    behind    bind    blind    combined    confined    consigned    declined   

unravelling    unwound    disembarkment    unraveling    characters'    sever    red-fringed    bright-hued    aramid    gay-coloured