へる
to decrease, to diminish
Water going out of the bowl until there is less in it than there was. The population has been at it for years, and so has his hair へる: へる.
減らす へらす is you reducing something. 減る is it going down on its own.
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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.