Phrase guide

know one's onions

verb · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

verb

Meaning 1

Synonym of know one's stuff, to be knowledgeable about a given subject or task.

Definition source: English Wiktionary via Wiktextract

Usage: informal

Examples

  • Joe really knows his onions when it comes to cooking.

Meaning relationships

Synonyms: know one's stuff, to be knowledgeable about a given subject or task

Antonyms: none provided

History

Etymology

No etymology was provided for this word.