sure cure
A remedy that won't fail, as in Hard work is a sure cure for brooding. Originating in the late 1800s as an advertising slogan (Dr. Keck's Sure Cure for Catarrh; first recorded in 1881), this rhyming phrase was soon extended to other matters.
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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.