Untie

verb

1. To loosen, as something interlaced or knotted; to disengage the parts of.

   "to untie a knot"

2. To free from fastening or from restraint; to let loose; to unbind.
3. To resolve; to unfold; to clear.
4. To become untied or loosed.
5. In the Perl programming language, to undo the process of tying, so that a variable uses default instead of custom functionality.