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.