throw (someone) under the bus

phrase

informal

: to criticize, blame, or punish (someone in a vulnerable position) especially in order to avoid blame or gain an advantage

… we will not throw any student under the bus for instant restoration of our image or our reputation.

—Donna Shalala

But he went out of his way to make clear that this one wasn't really on him. The problem lay with underlings, whom he quickly threw under the bus.

—Rem Rieder