Sweep something under the carpet
Definition 1 of 1
Pro Tip 1/3Hidden Issues
Used when problems are deliberately ignored, as if hiding them fixes the problem. 
He just swept his failed projects under the carpet, hoping no one would notice.
Pro Tip 2/3Negative Connotation
It implies a negative judgment, suggesting irresponsibility or avoidance. 
Sweeping her poor performance under the carpet, she avoided the necessary improvements.
Pro Tip 3/3Not Literal
It's metaphorical and doesn't involve actual sweeping or carpets. 
When she broke the vase, she metaphorically swept the incident under the carpet.