きえる
to go out, to disappear
You turn the key きえ in the lock, the light goes, and the whole room goes with it: きえる.
消す けす is you turning it off; 消える is it going out. Same split as 出る and 出す.
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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.