churn

Short definition from Wiktionary

Verb

1. 1
   To agitate rapidly and repetitively, or to stir with a rowing or rocking motion; generally applies to liquids, notably cream.
2. 2
   To produce excessive and sometimes undesirable or unproductive activity or motion.
3. 3
   To move rapidly and repetitively with a rocking motion; to tumble, mix or shake.
4. 4
   To stop using a company's product or service.
5. 5
   To repeatedly cancel and rebook a reservation in order to refresh ticket time limits or other fare rule restrictions.
6. 6
   To continually sign up for new credit cards in order to earn signup bonuses, airline miles, and other benefits.
7. 7
   To carry out wash sales in order to make the market appear more active than it really is.

Noun

1. 1
   A vessel used for churning, especially for producing butter.
2. 2
   A milk churn (container for the transportation of milk).
3. 3
   Customer attrition; the phenomenon or rate of customers leaving a company.
4. 4
   The time when a consumer switches his/her service provider.
5. 5
   The mass of people who are ready to switch carriers.
6. 6
   Cyclic activity that achieves nothing.
7. 7
   The last grain cut at harvest; kern.