Definition of churns:
(v) :
(business, of a customer) To stop using a company's product or service.
(n) :
(business, uncountable) Customer attrition; the phenomenon or rate of customers leaving a company.
(v) :
(transitive, figuratively) To produce excessive and sometimes undesirable or unproductive activity or motion.
(v) :
(transitive) To agitate rapidly and repetitively, or to stir with a rowing or rocking motion; generally applies to liquids, notably cream.
(v) :
(intransitive) To move rapidly and repetitively with a rocking motion; to tumble, mix or shake.
(v) :
(informal, travel, aviation) To repeatedly cancel and rebook a reservation in order to refresh ticket time limits or other fare rule restrictions.