noun, noun or participle which takes 'suru', intransitive verb
temporary school closure; school closed
Used when a school is officially closed for a limited period, e.g., due to weather, holidays, or special events. Often used in news and announcements.
台風のため、明日は休校になります。
School will be closed tomorrow due to the typhoon.
インフルエンザで学年閉鎖になり、事実
With the grade-level closure because of the flu, it's effectively a school closure.