to unfairly make someone take the blame for a mistake or failure to deflect responsibility

事情搞砸了，不要总想着给无辜的人扣屎盆子。

to ruin someone's reputation by making false, malicious, or shameful accusations

那些造谣者到处给竞争对手扣屎盆子，这种行为非常卑鄙。