1. to make turbid by stirring up sediment
2. to disturb or make angry; to upset

Examples

• The storm roils the lake water, making it impossible to see the bottom.
• Heavy rain roils the normally clear stream.
• The controversial decision roils the community.
• Bad news from work roils his mood for the entire evening.
• The muddy boots roil the clean water in the bucket.
• Political scandals continue to roil the election campaign.