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open mind

A mind receptive to different opinions and ideas, as in Her open mind could see merit in the new method. This phrase is often put as keep an open mind, as in The judge cautioned the jury to keep an open mind while hearing the evidence. [First half of 1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.