rolling (something); knocking down
fishing with multiple hooks on a weighted line
repeatedly buying and selling
子供たちは校庭で転がしに熱中した。
The children became absorbed in rolling games on the schoolyard.
転がしでピンを倒す技がある。
There's a technique to knock down pins by rolling.
ボウリング場で転がしの技術を習得した。
I mastered the rolling technique at the bowling alley.