grist for the mill
Something that can be used to advantage, as in These seemingly useless data will be grist for the mill when he lodges a complaint. This expression alludes to grist, the amount of grain that can be ground at one time. [Late 1500s]
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Words nearby grist for the mill
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.