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to good purpose

To effective use, as in A donation to the homeless shelter will be put to good purpose. This idiom was first recorded in 1553. Also see to little or no purpose.

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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.