From The Collaborative International Dictionary of English v.0.48:
Untie \Un*tie"\, v. t. [AS. unt[=y]gan. See 1st Un-, and
Tie, v. t.]
[1913 Webster]
1. To loosen, as something interlaced or knotted; to
disengage the parts of; as, to untie a knot.
[1913 Webster]
Sacharissa's captive fain
Would untie his iron chain. --Waller.
[1913 Webster]
Her snakes untied, sulphurous waters drink. --Pope.
[1913 Webster]
2. To free from fastening or from restraint; to let loose; to
unbind.
[1913 Webster]
Though you untie the winds, and let them fight
Against the churches. --Shak.
[1913 Webster]
All the evils of an untied tongue we put upon the
accounts of drunkenness. --Jer. Taylor.
[1913 Webster]
3. To resolve; to unfold; to clear.
[1913 Webster]
They quicken sloth, perplexities untie. --Denham.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Untie \Un*tie"\, v. i.
To become untied or loosed.
[1913 Webster]