know one\'s onions

[uhn-yuhn]

on·ion

[uhn-yuhn]
noun
1.
a plant, Allium cepa, of the amaryllis family, having an edible, succulent, pungent bulb.
2.
any of certain similar plants.
3.
the bulb of the onion plant.
4.
the flavor or odor of this bulb.
5.
Slang. a person: He's a tough onion.
adjective
6.
containing or cooked with onions: onion soup.
7.
of, pertaining to, or resembling an onion.

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Know one's onions is always a great word to know.
So is bezoar. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
8.
know one's onions, Slang. to know one's subject or business thoroughly; be capable or proficient.

Origin:
1325–75; Middle English onyon < Old French oignon < Latin ūniōn- (stem of ūniō) a unity, large pearl, onion; see union

on·ion·like, adjective
on·ion·y, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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