The exact origin of the idiom "up to no good" is unclear, as it has been a part of the English language for a significant period of time. The phrase is derived from the combination of "up to," meaning engaged in or involved in, and "no good," which refers to actions or intentions that are negative, dishonest, or harmful. It is commonly used in informal conversations, storytelling, or when expressing skepticism or distrust towards someone.

What is the origin of the idiom "up to no good" and when to use it?

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英語での「up to no good」の定義と意味

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