あける
to open, to unlock
The window does not slide itself. Somebody has to get up, and that shoulder aches あけ every single time: あける.
The third of the set: 開く あく is it opening on its own, 開く ひらく is spreading something open, 開ける あける is you opening it.
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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.