すきま
crack, gap
A crack and the gap inside it, which turns out to be exactly the width of one cat. A ski すき through the ma ま, and that is how it got in: すきま.
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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.