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churn something out
to produce something in large numbers, perhaps carelessly. We churn toys out by the thousand. This factory can churn out these parts day and night.
churn something outalso churn something out
to produce something in large amounts and without much thought Rosco churned out a book a year for 13 years and earned a lot of money doing it.
Produce in an abundant and automatic manner, as in He churned out a novel every six months. This idiom transfers the turning of milk into butter to other kinds of production. [Early 1900s]
To produce something in an abundant and automatic manner: The author churns out four novels a year. Although the chairs look handmade, the company churns them out in a factory.