off day

noun
🔊/ˈɒf deɪ/
🔊/ˈɔːf deɪ/
(informal)
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  1. a day when you do not do things as well as usual不顺利的日子;倒霉的一天
    • Even the best players sometimes have an off day.甚至最好的球员有时也会放假一天。