綴じる
とじる · tojiru · JLPT N3 · verb-ichidan
to bind
🧵📎 Sounds like 閉じる (to close): thread 糸 closes the pages into one file
綴 has the thread radical 糸 plus 叕, a stack of strokes joined together. Old books were sewn along the spine, so binding means closing loose pages with thread. That is why it shares the sound tojiru with 閉じる, to close.