Churning

To agitate rapidly and repetitively, or to stir with a rowing or rocking motion; generally applies to liquids, notably cream.

"Now the cream is churned to make butter."

To produce excessive and sometimes undesirable or unproductive activity or motion.

To move rapidly and repetitively with a rocking motion; to tumble, mix or shake.

"I was so nervous that my stomach was churning."

(of a customer) To stop using a company's product or service.

The act by which something is churned.

The quantity of butter prepared (by churning) at one time.