ころがる
to roll over, to tumble
A cart wheel going over and over with nobody steering it. The cat did that on the sand for ten minutes and came up with a collar ころ full of the stuff: ころがる.
転がす ころがす is you rolling something. 転がる is it rolling 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.