しよう
usage
Two characters for using it stacked one on the other, which is what makes it the formal word. She し, and the same Yo よう from your doorway. Read the manual first: しよう.
使う つかう is the everyday verb and 利用 りよう is making use of a service. 使用 is the formal noun, the one on signs and manuals.
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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.