what does one know
idiom
informal
—used to say that someone is wrong about something
"She thinks I should take the job." "What does she know? You should do what you want."
Cite this Entry
“What does one know.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/what%20does%20one%20know. Accessed 31 Jul. 2025.
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Merriam-Webster unabridged
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