The phrase "know your onions" originated in the early 20th century, particularly popularized in the 1920s. It means to be knowledgeable or well-informed about a particular subject or area of expertise. The expression implies having a deep understanding or competence in a field, akin to saying someone "knows their stuff." The exact origin of the phrase is unclear, but it is thought to have emerged from the slang of the time, possibly as a playful or humorous way of expressing expertise.
what's does the phrase know your onions from the 1920's mean
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