The idiom "like a knife through butter" does not have a specific documented origin, but it is a figurative expression that likens the ease of an action or task to the smooth and effortless way a sharp knife can cut through butter. It is used to describe how smoothly or easily something is done, as if there were no resistance or obstacles. It is a metaphorical expression that likens the ease of a task or action to the effortless way a sharp knife can cut through butter.

What is the origin of the idiom "like a knife through butter" and when to use it?

Definition und Bedeutung von „like a (hot) knife through butter“ im Englischen

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