know one's stuff

know (one's) stuff

To be very knowledgeable or skilled in some area. I think Nicole is our best candidate for the job—she really knows her stuff when it comes to corporate accounting.

know one's stuff

Also, know one's onions. Be experienced or knowledgeable in one's field or in the matter at hand. For example, Patrice knows her stuff when it comes to Mexican history, or We need a handyman who knows his onions. The allusion in the variant is unclear. [First half of 1900s]

词组	know one's stuff
释义	know one's stuff know (one's) stuff To be very knowledgeable or skilled in some area. I think Nicole is our best candidate for the job—she really knows her stuff when it comes to corporate accounting. See also: know, stuff Farlex Dictionary of Idioms. know one's stuff Also, know one's onions. Be experienced or knowledgeable in one's field or in the matter at hand. For example, Patrice knows her stuff when it comes to Mexican history, or We need a handyman who knows his onions. The allusion in the variant is unclear. [First half of 1900s] See also: know, stuff The American Heritage® Dictionary of Idioms by Christine Ammer. See also: know (one's) stuff know stuff know your stuff know your onions know (one's) onions know about know about (someone or something) have a good command of have a good command of (something) triple threat
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