届
とどけ · todoke · JLPT N1 · noun
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届 — corpse radical 尸 + 由
届 originally combined 尸 (a bent body) with a phonetic element, depicting someone arriving at a destination. Over time it came to mean 'to reach,' 'arrive at,' or 'fall due,' and is now used for sessions or terms (e.g., a graduating class) that arrive on schedule.