Definition of what does one know
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."
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“What does one know.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/what%20does%20one%20know. Accessed 24 Jun. 2022.
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