v. t. [ 1st pref. un- + twist. ] [ 1913 Webster ]

1. To separate and open, as twisted threads; to turn back, as that which is twisted; to untwine. [ 1913 Webster ]

If one of the twines of the twist do untwist,
The twine that untwisteth, untwisteth the twist. Wallis. [ 1913 Webster ]

2. To untie; to open; to disentangle. Milton. [ 1913 Webster ]