- duty
- noun
1 STH YOU HAVE TO DO (C, U) something that you have to do because it is morally or legally right(+ to/towards): Ian felt a sense of duty towards his parents. | have a duty to do sth/be your duty to do sth: The company has a duty to its shareholders to accept the highest bid. | As Christians it's our duty to help the less fortunate. | do your duty: You must do your duty and report him to the police. | be (in) duty bound to do sth (=have a duty to do something)2 PART OF YOUR JOB (countable usually plural, uncountable) something you have to do as part of your job or because of your social position: Your duties will also include coordinating secretarial support to the Head of Planning. | medical/official etc duties: Illness prevented her from carrying out her official duties. | report for duty (=go somewhere and officially say you are ready to work): Private Jones reporting for duty, Sir.3 be on/off duty to be working or not working at a particular time, especially doing a job which people take turns to do so that someone is always doing it: It was the same nurse who was on duty when you had your accident. | be on night duty: Helen is on night duty all next week.4 TAX (C, U) a tax you pay on something you buy: The duty on wine has gone up. | customs duty (=tax paid on goods coming into the country)—see also: death duty, stamp duty, tax 15 do duty as/for sth to be used as something
Longman dictionary of contemporary English. 2004.