Etymology
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unhinge (v.)

recorded 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) "opposite of" + hinge (n.). Hinge as a verb meaning "to attach by a hinge" is recorded only from 1758. Related: Unhinged; unhinging.

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Definitions of unhinge

unhinge (v.)
disturb in mind or make uneasy or cause to be worried or alarmed;
unhinge (v.)
remove the hinges from;
unhinge the door
From wordnet.princeton.edu