Webster's Revised Unabridged Dictionary · 1913

Unwind

Unwind , transitive verb

[Anglo-Saxon unwindan. See 1st Un-, and Wind to coil.]

1.
To wind off; to loose or separate, as what or convolved; to untwist; to untwine; as, to unwind thread; to unwind a ball of yarn.
2.
To disentangle. [Obsolete] — Hooker

Unwind , intransitive verb

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