かす
to lend, to lease
Money handed across as a stand-in for whatever comes back later. He has had that book a month and some of the cash かす with it: かす.
借りる かりる is the other side of the same arrangement, borrowing. 貸す is you handing it out.
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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.