The origin of the idiom "know one's stuff" is derived from the word "stuff" in the sense of knowledge, expertise, or skills. It is a colloquial expression that has been used to describe someone's proficiency or competence in a particular field or subject matter. This expression is used to convey that someone possesses a deep understanding and expertise in a specific area or topic. It is often employed to commend or acknowledge a person's knowledge and competence, especially in professional or academic contexts.

What is the origin of the idiom "know one's stuff" and when to use it?

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to [know] {one's} stuff

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英語での「know one's stuff」の定義と意味

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