expression, noun
citizen's holiday; sandwich holiday
A legal term for a weekday that falls between two national holidays, automatically becoming a holiday. Between 1985 and 2006, May 4 was designated as 国民の休日; it was later replaced by みどりの日 (Greenery Day).
See also: みどりの日 (みどりのひ)
5月4日は、かつて国民の休日と呼ばれていた。
May 4th was once called Citizen's Holiday.
祝日と祝日に挟まれた平日は、国民の休日となる。
A weekday sandwiched between two national holidays becomes a Citizen's Holiday.