know one's stuff

English

Verb

know one's stuff (third-person singular simple present knows one's stuff, present participle knowing one's stuff, simple past knew one's stuff, past participle known one's stuff)

  1. (intransitive, informal) To be knowledgeable about and competent at a particular subject or task.
    Joe really knows his stuff when it comes to baseball.
    • 2020, Emmet Sweeney, The Theban Empire, volume 3, page 176:
      The field of knowledge in which Hori claimed to be an authority was Palestinology. The contents of the missive show that Hori certainly knew his stuff.

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