churn

The boat's engine started to churn the muddy water as it pulled away from the shore.

(Chinese) 当船离开岸边时，发动机开始剧烈翻动泥泞的水面。

My stomach began to churn with anxiety as I waited for my turn to speak.

(Chinese) 当我等待轮到我发言时，我的胃因为焦虑而剧烈翻腾。