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)

(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.

Synonyms

Antonyms

See know one's ass from a hole in the ground

Translations

be generally experienced and knowledgeable

Danish: kende sin vej rundt
Polish: znać się na czymś impf
Turkish: avucunun içi gibi bilmek (tr)

knowledgeable in a particular field

Danish: kunne sit kram, være velindsat
Finnish: osata hommansa
French: toucher sa bille (fr)
German: sich gut auskennen, gut Bescheid wissen
Italian: sapere il fatto proprio

knowledgeable in a specific situation

Danish: vide hvilken vej der vender op

Further reading

“know one's stuff”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.

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