noun, noun, used as a suffix
report; notification; registration
Refers to a formal written notice submitted to an authority, such as a government office, school, or company. Often used as a suffix in compound nouns like 欠席届 (absence notice) or 出生届 (birth registration).
市役所に転出届を提出した。
I submitted a moving-out notification to the city office.
欠席届は前日までに出してください。
Please submit your absence report by the day before.