to have an off night
To have a night when you are not at your best. For instance, in a soccer match, a goalie who fails to make several easy saves could be having an "off day (or night)."
To have a night when you are not working. This is more commonly reversed as "a night off"1.
Night off means a free night, a night when one is not at work2.
Learn more:
1. forum.wordreference.com
2. vdict.pro
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