What does on/off duty mean?

phr. When someone is on duty, they are working, and when they are off duty, they are not working.

on/off duty

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Tags CEFR-B2

phrase

When someone is on duty, they are working, and when they are off duty, they are not working.

Are you on or off duty this weekend?

When someone is on duty, they are working, and when they are off duty, they are not working.