hoop trundling; hoop rolling
A traditional children's activity where a large hoop is rolled along the ground using a stick. The term can refer to both the toy and the game.
Children in the old days often played with hoop rolling.
A hoop rolling contest is held in this park.
Compound of 輪 (wa, 'hoop') and 回し (mawashi, 'rolling, turning'). The reading わまわし is a straightforward combination of these elements.