Definitions
1.VerbTo loosen, as something interlaced or knotted; to disengage the parts of."to untie a knot"
2.VerbTo free from fastening or from restraint; to let loose; to unbind.
3.VerbTo resolve; to unfold; to clear.
4.VerbTo become untied or loosed.
5.VerbIn the Perl programming language, to undo the process of tying, so that a variable uses default instead of custom functionality.