The amount that a churn can hold; as much as fills one churn.
From 'churn' plus the suffix '-ful' (meaning 'as much as will fill' a container), a productive suffix creating measurement nouns like 'handful,' 'bucketful,' and 'spoonful.'
The '-ful' suffix is ancient and productive—it creates measurement words from containers, and interestingly, its plural can be either 'churnsful' or 'churnfuls,' reflecting how English speakers argue about language even in compound words!
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