Definition of "unhinge"

unhinge

/ʌnˈhɪnd͡ʒ/

verb
third-person singular simple present unhinges, present participle unhinging, simple past and past participle unhinged
1. To remove the leaf of a door or a window from its supporting hinges.
2. (zoology, of a joint) To dislocate.
3. To mentally disturb.
  Quotations
  Taizong's failure fooled no one. Indeed, one of Taizong's own sons may well have been unhinged by his father's obvious fratricidal and nepoticidal actions. These personal considerations directly affected Taizong's policy decisions, and thus warrant some discussion.
  2008, Peter Lorge, “The Great Ditch of China and the Song-Liao Border”, in Don J. Wyatt, editor, Battlefronts Real and Imagined: War, Border, and Identity in the Chinese Middle Period, New York, N.Y.: Palgrave Macmillan, pages 59–74 at 67