Definition of on or off duty in English:

on (or off) duty

Engaged (or not engaged) in one’s regular work: the doorman had gone off duty and the lobby was unattended
More example sentences
  • The few regular carers on duty tried to talk to the quartet, hoping to mollify them.
  • The day my mother died the regular nurse was off duty, and a replacement came instead.
  • Are the core values inherent in you in all that you do, both on duty and off duty?
not working, at leisure, on holiday, on leave, off, off work, free
working, at work, busy, occupied, engaged;
on call, on standby
informal on the job, tied up
See parent entry: duty

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Word of the day retroflex
Pronunciation: ˈretrəˌfleks
turned backward