そまる
to be dyed, to be tainted
Water and a tree between them, and the colour goes the whole way through rather than sitting on the surface. So そ, more まる of it than you ever put in. Hemp takes it well: そまる.
染める そめる is you dyeing something. 染まる is it taking the colour, and both of them do being tainted by the company you keep.
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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.