What is Churn ?
Churn is (noun) a large metal container for milk Churns of fresh milk were lined up at the farm entrance waiting to be picked up. (verb) 1. to turn cream to make butter Do you know of any farm where butter is still churned by hand? 2. to buy and sell shares on someone’s behalf, in order to earn commission for yourself Few small investors realise how much money they lose through churning.
source: Easier English, Student Dictionary Upper Intermediate Level