sweep under the rug
Hide something, as in Their attempts to sweep the scandal under the rug were not very successful. This idiom alludes to sweeping dust under the rug, so it won't be seen. [Mid-1900s]
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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.