あずける
to deposit, to entrust
You hand it across in advance and somebody else's head is on it now. As you're あずける going that way anyway, he said, and the key went with him: あずける.
預かる あずかる is the other side of it, looking after something for somebody else.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.