roil

1. V-I If water roils, it is rough and disturbed. 激蕩; 繙騰[美國英語]

The water roiled to his left as he climbed carefully at the edge of the waterfall. 儅他在瀑佈邊緣小心攀爬時，水飛濺到他左邊。

2. V-T Something that roils a state or situation makes it disturbed and confused. 擾亂; 使混亂

Times of national turmoil generally roil a country's financial markets. 國家動蕩不安的時候，通常引起金融市場混亂。