From The Collaborative International Dictionary of English v.0.48:
Unhinge \Un*hinge"\, v. t. [1st pref. un- + hinge.]
[1913 Webster]
1. To take from the hinges; as, to unhinge a door.
[1913 Webster]
2. To displace; to unfix by violence. --Blackmore.
[1913 Webster]
3. To render unstable or wavering; to unsettle; as, to
unhinge one's mind or opinions; to unhinge the nerves.
[1913 Webster]
Why should I then unhinge my brains, ruin my mind?
--South.
[1913 Webster]
His sufferings, nay the revolutions of his fate, had
not in the least unhinged his mind. --Walpole.
[1913 Webster]