know one's stuff

idiom

Definition of know one's stuff

informal
: to be an expert at something When it comes to gardening, she really knows her stuff.

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Cite this Entry

“Know one's stuff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know%20one%27s%20stuff. Accessed 15 Aug. 2020.

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