backedduty
nounUK /ˈbæktˌdjuːti/
US /ˈbæktˌduːti/
A job you must do to help someone who helped you before.
After his friend carried his books, Tom felt it was a backedduty to help him in return.
RELATED WORDS
OTHER MEANINGS
2. A duty that supports or protects someone from behind.
The guard's backedduty was to watch the rear gate.
3. Work done to prepare something in advance.
The team's backedduty included packing supplies the night before.
4. A task assigned to a backup helper.
When the main cook got sick, the backedduty fell to his assistant.