noun
authorized absence form; absence permission slip
A formal document submitted to an institution (school, workplace) to obtain official approval for an absence. Often used in educational contexts.
See also: 公欠届
病気で休むときは、公認欠席届を提出してください。
When you are absent due to illness, please submit an authorized absence form.
公認欠席届は学生課で受け取れます。
You can get the authorized absence form at the student affairs office.
公欠届 is a shorter synonym often used in the same contexts; 公認欠席届 is more explicit and formal.
Compound of 公認 (official recognition) + 欠席 (absence) + 届 (notification, report).