Word.ws English Dictionary

knows one's onions

knows one's onions is the third-person singular simple present indicative of know one's onions.

Meaning of know one's onions

Verb

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

  1. (informal) Synonym of know one's stuff: to be knowledgeable about a given subject or task.
    • Joe really knows his onions when it comes to cooking.

Questions about knows one's onions

What is knows one's onions the third-person singular simple present indicative of?
Knows one's onions is the third-person singular simple present indicative of know one's onions.

Words near knows one's onions in the dictionary

  1. knows one's arse from one's elbow
  2. knows one's ass from a hole in the ground
  3. knows one's ass from one's elbow
  4. knows one's head from a hole in the ground
  5. knows one's head from one's ass
  6. knows one's onions
  7. knows one's own head
  8. knows one's own mind
  9. knows one's place
  10. knows one's shit
  11. knows one's stuff

Source and license

Adapted from Wiktionary: knows one's onions (page history and authors); know one's onions (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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