know (one's) onions

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know (one's) onions

To be very knowledgeable or skilled in some area. Primarily heard in UK, Australia. I think Nicole is our best candidate for the job—when it comes to corporate accounting, she really knows her onions.
See also: know, onion
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

know your onions

BRITISH, OLD-FASHIONED
If you know your onions, you know a lot about a particular subject. She really knows her onions in the historical field. Note: This may derive from the rhyming slang `onion rings', meaning `things'.
See also: know, onion
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

know your onions

be fully knowledgeable about something. informal
Onions is perhaps short for rhyming slang onion rings , meaning ‘things’. The phrase dates from the 1920s.
See also: know, onion
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
The fans who come to our shows can see we know our onions when it comes to country music.
'I was guilty of thinking country music was naff' MUSIC Americana comes to Birmingham thanks to country music couple My Darling Clementine. They tell Roz Laws about how Elvis Costello brought them together
Here in the real world we know our onions - even if they are frozen.
Custard and packets
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