The New Leader Of The Shamed...
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No best answer has yet been selected by juliew. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.It took on the meaning of "a day/days off work" around 6/700 years ago. Prior to then, the only 'time off work' had been on the Church's holy days, so the meaning just transferred over.
Now, of course, the idea of 'holy' days is one that only the religious among us pay attention to.