1.
compensatory day off; substitute holiday
A day off granted to an employee as compensation for having worked on a regular day off or holiday.
代休を取る。
I'll take a compensatory day off.
土曜日に出勤したので、月曜日に代休をもらった。
Since I worked on Saturday, I got a compensatory day off on Monday.
忙しくて代休がなかなか消化できない。
I'm so busy that I can't manage to use up my compensatory days off.
Common collocations include 代休を取る (to take a comp day), 代休をもらう (to be given a comp day), and 代休を消化する (to use up comp days). Legally distinct from 振替休日 (transferred holiday), which is scheduled in advance before working on a day off. 代休 is granted after the fact, usually at a later date chosen by the employee or employer.