from bad to worse
Unacceptable and getting more so, on a steady downward course. For example, Mary's grades have gone from bad to worse. [Mid-1500s] Also see if worst comes to worst.
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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.