転がる
ころがる · korogaru · JLPT N2 · verb-godan
to roll
⚽ 転 means turn, as in 回転 (rotation): 転がる is to turn over and over, to roll
The kanji 転 (ten, koro) means turn or revolve, the same root as 回転 (rotation). 転がる describes something turning over and over on the ground, like a ball rolling or a person tumbling.