Throw someone under/underneath the bus
잘못된 것을 남탓으로 돌리다

1. Exploit someone's trust for one's own purpose, gain or agenda ; to harm someone through deceit or treachery.
2. To avoid blame, trouble, or criticism by allowing someone else to take responsibility.

Examples)

Tommy was caught with marijuana in his backpack, but he threw me under the bus and said it belonged to me.
토미는 그의 가방에 마리화나가 있는 것을 들켰다. 그런데 내탓으로 돌렸고 나의 것이라고 이야기 했다.

Our manager never hesitates to throw an underling under the bus when something goes wrong in the office.
우리 매니저는 회사에 무슨 일이 생겼을때, 절때로 부하직원의 탓으로 돌리지 않는다.