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dash someone's hopes

Destroy someone's plans, disappoint or disillusion. For example, That fall dashed her hopes of a gold medal. This term uses dash in the sense of “destroy,” a usage surviving only in this idiom. [Second half of 1500s]

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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.