As a noun: cylindrical containers used for agitating milk into butter. As a verb: third-person singular of 'churn,' meaning to agitate vigorously or to produce something continuously.
From Old English 'cyrne' or 'chyrne,' likely from a Germanic root meaning 'to turn.' The word has been in continuous use since at least the 10th century, with both the tool and the action bearing the same name.
The humble churn inspired metaphorical language that's still alive today—we still say markets 'churn,' emotions 'churn,' and stomachs 'churn,' showing how a medieval kitchen tool became a template for describing any violent, repetitive motion!
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