knew one's onions

A form of know one's onions — Synonym of know one's stuff: to be knowledgeable about a given subject or task.

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Meanings

verb
  1. pastsimple past of know one's onions
Cite this entry
APA

knew one's onions. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/knew%20one's%20onions

MLA

“knew one's onions.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/knew%20one's%20onions. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “knew one's onions,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/knew%20one's%20onions.

Source: knew one's onions on Wiktionary, CC BY-SA 4.0.