know no more about (something) than a pig knows about Sunday

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know no more about (something) than a pig knows about Sunday

To know absolutely nothing about something. Primarily heard in US. I don't know why Uncle Tony left the farm to Albert. He knows no more about farming than a pig knows about Sunday! Oh, stop lecturing me. You know no more about running a business than a pig knows about Sunday!
See also: know, more, no, pig, Sunday
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