necessary duty
noun phraseUK /ˈnɛsəsəri ˈdjuːti/
US /ˈnɛsəˌsɛri ˈduːti/
A job you must do because it is needed.
Feeding the dog is a necessary duty every morning.
RELATED WORDS
OTHER MEANINGS
2. A legal or official task that someone is required to perform.
Paying taxes is a necessary duty for every citizen.
3. A moral action a person feels they ought to complete.
Visiting his sick grandmother was a necessary duty he never skipped.
4. A routine job that keeps something working properly.
Checking the tires is a necessary duty before a long drive.