1. (水)激荡，翻滚，翻腾
If water roils, it is rough and disturbed.

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

1. make turbid by stirring up the sediments of

Synonym: rile

2. be agitated

e.g. the sea was churning in the storm

Synonym: churnboilmoil