roil

1. V-I If water roils, it is rough and disturbed. 激荡; 翻腾[美国英语]

The water roiled to his left as he climbed carefully at the edge of the waterfall. 当他在瀑布边缘小心攀爬时，水飞溅到他左边。

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

Times of national turmoil generally roil a country's financial markets. 国家动荡不安的时候，通常引起金融市场混乱。