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duty

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duty/ˈduːti/
British/ˈdjuːti/noun
pluralduties
duty
/ˈduːti/British/ˈdjuːti/
noun
pluralduties
Learner's definition of DUTY  
: something that is done as part of a job
[count]
[noncount]
Synonyms see: 1task
: something that you must do because it is morally right or because the law requires it
[count]
[noncount]
[noncount]  : active military service
: a tax on goods that are being brought into a country
[count]
[noncount]

do duty as

: to do the work of (someone or something)
: to be used as (something)

off duty

: not working at a particular time

on duty

: working at a particular time
— see also heavy duty
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