know one's stuff
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Definition & Meaning of "know one's stuff"

to know one's stuff
01

to be very knowledgeable about or skillful in a particular field of work

to [know] {one's} stuff definition and meaning
IdiomIdiom
InformalInformal

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

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.

example
Example
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When it comes to astronomy, Professor Smith really knows his stuff.
If you have questions about history, ask Sarah.
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