よる
to be caused by
Trace the thing backwards and the cause is sitting there at the far end of it. The same よる as the evening and as dropping by, and this one is neither. Overwork, in his case: よる.
Three よる in the deck: 夜 night, 寄る dropping in on the way, and this one, written in kana. Attached to a noun as 〜による it means owing to.
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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.