おとな
adult
A big person, which is the whole of what the character claims, and the one telling you to listen. Oh おと, na な, and nothing in it says wise: おとな.
The reading is irregular and has to be learned whole, since neither 大 nor 人 is saying any part of おとな.
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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.