Etymology

Verb

1. 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.

2. To produce excessive and sometimes undesirable or unproductive activity or motion.
3. To move rapidly and repetitively with a rocking motion; to tumble, mix or shake.

   I was so nervous my stomach was churning.

Noun

1. A vessel used for churning.

   a butter churn

2. The time when a consumer switches his/her service provider.
3. The mass of people who are ready to switch carriers, expressed by the formula Customer Quits/Customer base.