know one's stuff
idiom
informal
: to be an expert at something
When it comes to gardening, she really knows her stuff.
Dictionary Entries Near know one's stuff
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“Know one's stuff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know%20one%27s%20stuff. Accessed 19 Apr. 2024.
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