The origin of the idiom "know one's onions" can be traced back to the early 20th century, particularly in the United States. The word "onions" in this idiom is a metaphor for expertise or knowledge in a specific area. It likely originated from the idea that if someone knows how to select, grow, and use onions effectively in cooking, they possess a certain level of culinary expertise. This expression is used to praise or acknowledge someone's deep knowledge, skill, or expertise in a particular field or subject matter.

What is the origin of the idiom "know one's onions" and when to use it?

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to [know] {one's} onions

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Définition et signification de « know one's onions » en anglais

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