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mind of one's own, have a

Think independently, reach one's own opinions or conclusions. For example, You can't tell Karen what she should wear—she has a mind of her own. Also see know one's own mind.

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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.