verb (used with object), unhinged, unhinging.
to remove (a door or the like) from hinges.
to open wide by or as if by removing supporting hinges: to unhinge one's jaws.
to upset; unbalance; disorient; throw into confusion or turmoil: to unhinge the mind.
to dislocate or disrupt the normal operation of; unsettle: to unhinge plans.
to detach or separate from something.
to cause to waver or vacillate: to unhinge supporters of conservative policies.

1605–15; un-2 + hinge

unhingement, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unhinge (ʌnˈhɪndʒ)
1.  to remove (a door, gate, etc) from its hinges
2.  to derange or unbalance (a person, his mind, etc)
3.  to disrupt or unsettle (a process or state of affairs)
4.  (usually foll by from) to detach or dislodge

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

used earlier in the mental sense of "to disorder" the mind, etc. (1612) than in the literal one of "to take (a door, etc.) off its hinges" (1616); from un- (2) + a verb derivative of hinge.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Indeed, the fossils bear skulls similar to those found in modern snakes that
  can almost completely unhinge their lower jaw.
If he can't win the game himself, he'll unhinge the opposition to set up
  someone else.
And because their jaws unhinge, the snakes can eat prey much larger than they
Living in the archives and my new interest in starvation have also done a lot
  to unhinge my devotion to eating three meals a day.
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