built-in duty
noun phraseUK /ˌbɪlt ˈɪn ˈdjuːti/
US /ˌbɪlt ˈɪn ˈduːti/
A job that comes with something and you must do it.
Feeding the class pet is a built-in duty of being the class helper.
RELATED WORDS
OTHER MEANINGS
2. A task that is part of a machine or system and happens automatically.
The phone's built-in duty is to back up your photos every night.
3. A responsibility that belongs to a job or position by default.
Checking the locks is a built-in duty of the night guard.
4. A moral job that comes with a role in a group.
Sharing the ball is a built-in duty of every team player.