"Churn out" is a commonly used idiom to describe a fast pace of production, often with a negative connotation of producing something in large quantities without much care or attention to detail. There are several synonyms to this term, including "crank out," "pump out," and "grind out." Each of these words conveys the sense of producing something quickly and without much thought, but they can also be used in different contexts. For instance, "crank out" can be used to describe producing a large amount of work quickly, while "pump out" might refer to producing a lot of information or content in a short amount of time. Overall, these synonyms for churn out can be useful for varying your language and avoiding repetition in your writing or speech.