Usually means: Be highly knowledgeable about something.
Definitions Related words Mentions
We found 5 dictionaries that define the word know one's onions:

General (4 matching dictionaries)
  1. know one's onions: Oxford Learner's Dictionaries
  2. know one's onions, know one's onions: Collins English Dictionary
  3. know one's onions: Wiktionary
  4. know one's onions, know ones onions: Dictionary.com

Slang (1 matching dictionary)
  1. know one's onions: English slang and colloquialisms used in the United Kingdom

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Definitions from Wiktionary (know one's onions)

▸ verb:  (informal) Synonym of know one's stuff, to be knowledgeable about a given subject or task.


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