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harden one's heart

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Feel no sympathy for, as in We can't afford to give them more; we'll just have to harden our hearts when they ask. [Late 1300s]

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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.

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