know (one's) onions

(redirected from know their 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

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

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
References in periodicals archive ?
Well, our Chefs, certainly agreed that they know their onions when it comes to pies with one saying, "Visually very good, good amount of meat, flavour good one of the best pies of this type I have tasted.
Newcastle fans know their onions, and all they ask of their team is pride in the shirt and expansive football, if possible.
They work in plant sales and have to know their onions.
Maybe the ladies and gentlemen in the stands do know their onions after all.
The Beeb has had a brainwave, and is serving up another gastronomic delight for foodies who know their onions.
THEY know their onions when it comes to finding a desperate-for-affection pup and then getting him so excited he chases his own tail and makes a mess on the lino.
If the next regime know their onions, they will have fans involved," he says.
FAMILY farming firm E Cook and Sons know their onions after more than 30 years in business - but the price of carrots caused problems last year.
While Jamie is trying to wean children off unhealthy burgers and chips, pupils at Cwm Glas Infants' School, Llanbradach, near Caerphilly are showing they know their onions.
Ryan Jones and Shane Williams were major stars of the Six Nations and now the New Zealand rugby folk - who know their onions - have seen what all the fuss was about.
Britons don't know their onions from their spuds when it comes to naming the best months for good food, a survey showed yesterday.
For example, new model teachers were to be innovative, enthusiastic and strict, yet know their onions and have lots of swank.
uk Real teal appeal JOHN Lewis certainly know their onions.
They know their onions, get results and don't go shouting about it from the rooftops.
People who know their onions can win hundreds of pounds.