From Longman Dictionary of Contemporary Englishdereliction of dutydereliction of dutyformalFAIL when someone fails to do what they should do as part of their job → dereliction
Examples from the Corpus
dereliction of duty• Retirement at a time when the opposition was strong was seen by many among them as a dereliction of duty.• It would be a dereliction of duty to talk to students only about firms, cheques, and the price of wheat.• Historians note that the Royal Family has survived scandals, an abdication and dereliction of duty before.• This was a disgraceful dereliction of duty.• He should have been put up against a wall and shot, if you ask me, for dereliction of duty.• That is a gross dereliction of duty.• Agit-poppers constantly castigate pop for its dereliction of duty and its straying from being aligned.• The officer in charge was cleared of dereliction of duty.• Many parents, irrespective of class, must also stand condemned for similar dereliction of duty. 