churn churn /ˈtʃɝːn/

noun

1. A vessel in which cream is agitated to separate butterfat from buttermilk  ( butter churn , churn )
   a vessel in which cream is agitated to separate butterfat from buttermilk
   
   

verb

1. () (cooking) stir (cream) vigorously in order to make butter  ( churn )
   (cooking) stir (cream) vigorously in order to make butter
   
2. Be agitated  ( boil , churn , moil [ N. American] , roil )
   be agitated
    The sea was churning in the storm
   the sea was churning in the storm