(1):

(v. t.) To free from fastening or from restraint; to let loose; to unbind.

(2):

(v. t.) To loosen, as something interlaced or knotted; to disengage the parts of; as, to untie a knot.

(3):

(v. i.) To become untied or loosed.

(4):

(v. t.) To resolve; to unfold; to clear.