さげる
to lower, to turn down
You take it down 下 rather than standing there watching it sag. The volume, a little: さげる.
下がる さがる is a thing coming down by itself. 下げる is you lowering 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.