たまる
to accumulate, to store up
Nobody put it there in one go. It kept arriving and none of it ever left. His stress, over months, and no tamer たまる anywhere in sight: たまる.
ためる is the transitive one, you piling something up or saving it. たまる is it accumulating 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.