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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](https://cdn.langeek.co/photo/44760/original/?type=jpeg "to [know] {one's} stuff definition and meaning")
Idiom
Informal
Example
When it comes to astronomy, Professor Smith really knows his stuff.
The mechanic at the garage knows his stuff; he fixed my car in no time.
