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.

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'.

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.

词组	know (one's) onions
释义	know (one's) onions 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. 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. 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 See also: know your onions know your stuff know one's stuff know stuff know (one's) stuff have a good command of have a good command of (something) know about know about (someone or something) triple threat
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