Definition of derange in English:

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Pronunciation: /dəˈrānj/


[with object]
1Cause (someone) to become insane: that business last month must have deranged him a bit
More example sentences
  • You're right Karen, most of my work has involved dealing with bizarre conspiracy theories told by people who often appear completely deranged.
  • People think of me as some kind of deranged comedian.
  • You know, this is really a deranged person that would be taking these shots and killing people or injuring people.
1.1Throw (something) into confusion; cause to act irregularly: stress deranges the immune system
More example sentences
  • In scoliosis, the anatomy is deranged not only at each vertebral level but also between the convex and concave sides of the curve in the spine.
  • As when an individual soldier lost his balance, many flailing and falling soldiers deranged the enemy formation causing a serious decrease in the enemy's own firepower.
  • Autosomal genes often showed deranged regulatory levels, indicating they were in pathways perturbed by X chromosomal changes.
1.2 archaic Intrude on; interrupt: I am sorry to have deranged you for so small a matter
More example sentences
  • From her gauze veiling the young woman spoke:-- "We are sorry to derange you. The guard made a mistake. Pardon!"



Pronunciation: /dəˈrānjmənt/
Example sentences
  • Another controversial issue is that of ‘cannabis psychosis’, or long-term mental derangement bought on by cannabis use.
  • She points out that only a proportion of its patients have been ordered there by a court after committing an offence through mental derangement.
  • There is no proof that they are suffering from any mental derangement.


Late 18th century: from French déranger, from Old French desrengier, literally 'move from orderly rows'.

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