wouldn't know (something) if (one) fell over one

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wouldn't know (something) if (one) fell over one

Is too oblivious or ignorant to realize or recognize a very obvious thing. You're no expert. You wouldn't know a Rembrandt if you fell over one. Tim's not much of a scout. He wouldn't know a promising pitcher if he fell over one.
See also: fell, if, know, one, over
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