Throw Under The Bus. (idiomatic, transitive, of a person or group) to betray or blame (something or someone), as a scapegoat or otherwise for personal gain. He has been accused of throwing fellow republicans under the bus for his personal agenda.

Slang expert paul dickson, quoted by william safire in his new york times magazine column, traces it to hence the saying, throw him/her under the bus meaning to sacrifice someone to benefit or to better your own situation.

It has been ubiquitous in the u.s. Senator davis was supposed to be working with me to bridge the gap between democrats and republicans on the issue of gun control, but, instead, she threw me under the bus to get a boost in the polls with her constituency. The expression throw someone under the bus comes from sports. I'm not going to throw my friend under the bus for something he did 25 years ago. The phrase has been widely popularized by sports journalists since 2004 and was picked up by the mainstream media during the 2008 primary. It's hard to pinpoint, but it became popular during the 2008 presidential election, according to merriam webster. And there some cases when you absolutely have to, else you lose social points because of their stupidity (or rudeness). It has frequently been used to describe various politicians. Thanks for throwing me under the bus! said lenny. To throw (someone) under the bus is an idiomatic phrase meaning to scapegoat or reject. Coaches often tell their athletes, you're either on the bus or under it. this means that all the players need to work together as a team in order to be the best that they can be.