Not know beans about something

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American Slang

A casual, slang phrase in American English, often used in informal conversations.

My cousin doesn't know beans about fixing cars.

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Emphasis on Ignorance

Used to stress someone's complete lack of knowledge on a subject, more than just a casual 'doesn’t know'.

You're asking the wrong person; she doesn't know beans about politics.

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Avoid in Formality

Not appropriate for formal or professional communications, like academic papers or business meetings.

In a job interview, avoid saying 'I don't know beans about this'.