Webster's Revised Unabridged Dictionary · 1913

Unthread

Unthread , transitive verb

[1st pref. un- + thread.]

1.
To draw or take out a thread from; as, to unthread a needle.
2.
To deprive of ligaments; to loose the ligaments of.
He with his bare wand can unthread thy joints. — Milton
3.
To make one's way through; to traverse; as, to unthread a devious path. — De Quincey