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1 N‑COUNT [oft N n] A deputy is the second most important person in an organization such as a business or government department. Someone's deputy often acts on their behalf when they are not there. □  …France's minister for culture and his deputy.

2 N‑COUNT In some parliaments or law-making bodies, the elected members are called deputies .

de|rail /diː re I l/ (derails , derailing , derailed )

1 VERB To derail something such as a plan or a series of negotiations means to prevent it from continuing as planned. [JOURNALISM ] □ [V n] The present wave of political killings is the work of people trying to derail peace talks.

2 VERB If a train is derailed or if it derails , it comes off the track on which it is running. □ [be V -ed] Several people were injured today when a train was derailed. □ [V ] No-one knows why the train derailed. [Also V n]

de|rail|ment /diː re I lmənt/ (derailments ) N‑VAR A derailment is an accident in which a train comes off the track on which it is running.

de|ranged /d I re I ndʒd/ ADJ Someone who is deranged behaves in a wild and uncontrolled way, often as a result of mental illness. □  A deranged man shot and killed 14 people.

de|range|ment /d I re I ndʒmənt/ N‑UNCOUNT Derangement is the state of being mentally ill and unable to think or act in a controlled way. [OLD-FASHIONED ]

der|by /dɑː ^r bi, [AM ] dɜː rbi/ (derbies )

1 N‑COUNT A derby is a sporting event involving teams from the same area or city. [BRIT ] □  …a North London derby between Arsenal and Tottenham.

2 N‑COUNT [oft n N ] A derby is a sports competition or race where there are no restrictions or limits on who can enter. [AM ]

de|regu|late /diː re gjʊle I t/ (deregulates , deregulating , deregulated ) VERB To deregulate something means to remove controls and regulations from it. □ [V n] …the need to deregulate the U.S. airline industry.

de|regu|la|tion /diː re gjʊle I ʃ ^ə n/ N‑UNCOUNT Deregulation is the removal of controls and restrictions in a particular area of business or trade. [BUSINESS ] □  Since deregulation, banks are permitted to set their own interest rates.

der|elict /de r I l I kt/ ADJ A place or building that is derelict is empty and in a bad state of repair because it has not been used or lived in for a long time. □  Her body was found dumped in a derelict warehouse less than a mile from her home.

der|elic|tion /de r I l I kʃ ^ə n/ N‑UNCOUNT If a building or a piece of land is in a state of dereliction , it is deserted or abandoned. □  The previous owners had rescued the building from dereliction.

de r|elic|tion of du ty N‑UNCOUNT Dereliction of duty is deliberate or accidental failure to do what you should do as part of your job. [FORMAL ] □  He pleaded guilty to wilful dereliction of duty.

de|ride /d I ra I d/ (derides , deriding , derided ) VERB If you deride someone or something, you say that they are stupid or have no value. [FORMAL ] □ [V n] Opposition MPs derided the Government's response to the crisis.

de ri|gueur /də r I gɜː ^r / ADJ [v-link ADJ ] If you say that a possession or habit is de rigueur , you mean that it is fashionable and therefore necessary for anyone who wants to avoid being considered unfashionable. □  T-shirts now seem almost de rigueur in the West End.

de|ri|sion /d I r I ʒ ^ə n/ N‑UNCOUNT If you treat someone or something with derision , you express contempt for them. □  He tried to calm them, but was greeted with shouts of derision.

de|ri|sive /d I ra I s I v/ ADJ A derisive noise, expression, or remark expresses contempt. □  There was a short, derisive laugh. ●  de|ri|sive|ly ADV [ADV with v] □  Phil's tormentor snorted derisively.

de|ri|sory /d I ra I zəri/