What does 串休 mean in reference to work week or holidays?
The only translation I can find is "break string".

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"串休“ means Company let you or you volunteer to work on the weekend or holiday，later you can take a rest equal to how many hours you worked in the past. Usually you can choose the day you want to take a rest if you have a good boss or leader,:).

Answer

串休 = 振り替え

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串休..mean is

For example : today should you rest day.but  your company tell you .you cant rest today you need work.....and they changed your holiday to tomorrow or the other day..

" sorry my poor english ... "