off duty
off duty {adj.}
Not supposed to be at work; having free time; not working.
Sailors like to go sight-seeing, when they are off duty in a foreign port.
It seems that all the taxis in New York are off duty whenever it rains.
- Often used with hyphens, before a noun.
The bank robber was captured by an off-duty policeman.
Contrast: ON DUTY.
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Source: A Dictionary of American Idioms