Definitions from Wiktionary (churn)

▸ verb:  (transitive) To agitate rapidly and repetitively, or to stir with a rowing or rocking motion; generally applies to liquids, notably cream.
▸ verb:  (transitive, figuratively) To produce excessive and sometimes undesirable or unproductive activity or motion.
▸ verb:  (intransitive) To move rapidly and repetitively with a rocking motion; to tumble, mix or shake.
▸ verb:  (business, of a customer) To stop using a company's product or service.
▸ verb:  (informal, travel, aviation) To repeatedly cancel and rebook a reservation in order to refresh ticket time limits or other fare rule restrictions.
▸ verb:  (US, informal, finance, travel) To continually sign up for new credit cards in order to earn signup bonuses, airline miles, and other benefits.
▸ verb:  (finance) To carry out wash sales in order to make the market appear more active than it really is.
▸ noun:  A vessel used for churning, especially for producing butter.
▸ noun:  A milk churn (container for the transportation of milk).
▸ noun:  (business, uncountable) Customer attrition; the phenomenon or rate of customers leaving a company.
▸ noun:  (telecommunications) The time when a consumer switches his/her service provider.
▸ noun:  (telecommunications) The mass of people who are ready to switch carriers.
▸ noun:  Cyclic activity that achieves nothing.
▸ noun:  (historical) The last grain cut at harvest; kern.
▸ Also see churn

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