American Dictionary

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Definition onion in American English

onion noun

[countable] noun
/ˈʌnjən/
1

a round vegetable with thin dry skin and many layers inside that tastes and smells very strong

Synonyms and related words
2

if you know your onions, you know a lot about a particular subject

Example

That tour guide really knew her onions, didn't she?

Definition onion in American English