From Longman Dictionary of Contemporary Englishchurn something ↔ out phrasal verbMAKEto produce large quantities of something, especially without caring about quality She’s been churning out novels for 20 years. → churn→ See Verb table
Examples from the Corpus
churn out• But in terms of the Championship race we churned a result out.• It is daily, just churning it out.• In fact he had been churning them out all along.• And at the press desk the computer churns them out, photograph and all.From Longman Business Dictionarychurn something → out phrasal verb [transitive] to produce large quantities of something, perhaps without caring about qualityThe plant churns out more than half a million cheap watches a month. → churn→ See Verb table 