Definition of derange in English:

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Pronunciation: /dɪˈreɪn(d)ʒ/


[with object]
1Make (someone) insane: that business last month must have deranged him a bit
More example sentences
  • Privately, she wondered if they were watching her to see if she would have a breakdown or if she was mentally deranged or something, but she said nothing to that effect.
  • Meanwhile, police based on preliminary investigation ruled out the possibility of him being mentally deranged.
  • His unhinged language suggested that persecution mania briefly deranged him.
Latin non compos mentis;
British  sectionable
informal touched, crazy, cracked, mental
British informal barmy, barking, barking mad, round the twist
1.1Cause (something) 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.
2 archaic Intrude on; disturb: 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: /dɪˈreɪn(d)ʒm(ə)nt/
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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