なおす
to repair, to cure, to alter
You look at the broken thing dead on and put it back the way it is supposed to be. Now なお, Sue す, rather than next week: なおす.
直る なおる is a thing mending on its own. 変える かえる turns something into something else, where 直す puts it right.
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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.