"churning" in the verb sense

1. churn

stir (cream) vigorously in order to make butter

2. churn, boil, moil, roil

be agitated

"the sea was churning in the storm"

"churning" in the adjective sense

1. churning, churned-up

moving with or producing or produced by vigorous agitation

"winds whipped the piled leaves into churning masses"

"a car stuck in the churned-up mud"

2. churning, roiling, roiled, roily, turbulent

of a liquid) agitated vigorously in a state of turbulence

"the river's roiling current"

"turbulent rapids"

Source: WordNet® (An amazing lexical database of English)

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