unkink

un·kink

 (ŭn-kĭngk′)
v. un·kinked, un·kink·ing, un·kinks
v.tr.
To remove kinks from; make straight.
v.intr.
To become relaxed.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

unkink

(ʌnˈkɪŋk)
vb (tr)
informal US to relax the muscular spasm or tightness in (the body or part of the body)
vb (intr)
informal US (of the body or part of the body) to relax after being tight or in spasm
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
It took me the rest of the run in to unkink my complaining joints and muscles and get into a standing position on the lower step.
Expectations for a deal have helped unkink the curve and are allowing the very competitive rates to attract good demand.
At first light they unkink themselves and spend the rest of the day reading.
Most passengers will be ready to stand, stretch and unkink by that point.
I felt my shoulder muscles unkink as I pictured the happy ending.
Such a rotational mode does not contribute to the relaxation of an applied stress, since it does not help unkink twisted segments.
So somewhere to sit, unkink the back and inspect the blisters is essential.
My neck muscles begin to unkink and the canned music leaves my head.
Instead, movements exaggerate abnormal positioning, providing the slack needed to unkink muscles.
In my day, girls kinked their necks by sleeping all night on 3-inch rollers to unkink their hair.
Inhalation unkinks the k-valve, releasing the medication as a spray.
I waded into cool crotch-high water and unkinked the Redington's superb action.