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From The Collaborative International Dictionary of English v.0.48:
Unthread \Un*thread"\, v. t. [1st pref. un- + thread.] [1913 Webster] 1. To draw or take out a thread from; as, to unthread a needle. [1913 Webster] 2. To deprive of ligaments; to loose the ligaments of. [1913 Webster] He with his bare wand can unthread thy joints. --Milton. [1913 Webster] 3. To make one's way through; to traverse; as, to unthread a devious path. --De Quincey. [1913 Webster]