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not know the first thing about

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not know the first thing about someone or something
Fig. not to know anything about someone or something. I don't know the first thing about flying an airplane. She doesn't know the first thing about John.
See also: first, know, thing

not know the first thing about something (spoken)
to know nothing about something not know beans about something I don't know why you're asking Alice, she doesn't know the first thing about sports.
See also: first, know, thing


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