From Longman Dictionary of Contemporary Englishsweep/brush something under the carpetsweep/brush something under the carpet (also sweep something under the rug American English)HIDE/NOT SHOW to try to keep something a secret, especially something you have done wrong → sweep
Examples from the Corpus
sweep/brush something under the carpet• We knew that it wouldn't just go away if we swept it under the carpet.• Refuse to sweep difficulties under the carpet but sort things out even when it is painful. 