know one's stuff
know one's stuff verb: to be knowledgeable about and competent at a particular subject or task.
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)
- To be knowledgeable about and competent at a particular subject or task.
- Joe really knows his stuff when it comes to baseball.
- 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.2020, Emmet Sweeney, The Theban Empire, volume 3, page 176
Synonyms of know one's stuff
- know ball
- know one's onions
- know one's shit
- know one's way around
- know the drill
- know the score
- know which end is up
Antonyms
Forms of know one's stuff
| third-person singular present | knows one's stuff |
|---|---|
| present participle | knowing one's stuff |
| past | knew one's stuff |
| past participle | known one's stuff |
Questions about know one's stuff
- What does know one's stuff mean?
- Know one's stuff means to be knowledgeable about and competent at a particular subject or task.
- What part of speech is know one's stuff?
- Know one's stuff is a verb.
- What is the past tense of know one's stuff?
- The past tense of know one's stuff is knew one's stuff.
Words near know one's stuff in the dictionary
Source and license
Adapted from Wiktionary: know one's stuff (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
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