Someone who moves quickly and energetically, or a tool with rotating blades used in a churn for making butter.
From the verb 'dash' (to move quickly, from Old Norse 'daska'), with agent suffix '-er.' The butter-churn meaning emerged as the device became common in domestic use.
A dash of originality and a dasher of butter churn sound completely unrelated, but they both come from the same root—'dash'—showing how one action word can spawn totally different tools and descriptions!
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