have a bad case of the simples
have a bad case of the simples
Rur. to be stupid. That boy has a bad case of the simples. He can't understand anything. She acts smart enough on the playground, but get her in the classroom and she has a bad case of the simples.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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