\Un*twist"\, v. t. [1st pref. un- + twist.]
1. To separate and open, as twisted threads; to turn back, as
   that which is twisted; to untwine.
         If one of the twines of the twist do untwist, The
         twine that untwisteth, untwisteth the twist.
                                               --Wallis.
2. To untie; to open; to disentangle. --Milton.