おじさん
uncle
Your parent's brother, and the same word for any middle-aged man whose name you were never given. Oh, Jason おじ, is it: おじさん.
One long vowel from おじいさん, grandfather. Short is the uncle and long is the grandfather, and おばさん and おばあさん split the same way.
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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.