derange UK /dɪˈɹeɪnd͡ʒ/US /diˈɹeɪnd͡ʒ/ verb4 •To cause disorder in (something); to distort from its ideal state. •To cause to malfunction or become inoperative. •To cause (someone) to go insane or become deranged. •(no longer used) To disrupt (somebody's) plans, to inconvenience; to derail."By no means, Sir," answered the Captain: "I shall be quite au désespoir if I derange any body." — 1782 formsderanged · deranging · deranges