The expression probably comes from the physical act of turning your back toward someone, instead of speaking to him face-to-face.

VOA: special.2009.12.13

Today's announcement comes after an-ongoing investigation by the Serious Fraud Office into BAE that dates back to the 1990s.

VOA: standard.2009.10.01

The case comes back, they have to do it all over again and spend more money,".

VOA: standard.2009.05.22

So I have held myself back just by my not realizing that when success comes, you have to go with it and build it,".

VOA: standard.2009.11.03

"So I urged these institutions here today to go back and take a third and fourth look about how they are operating when it comes to small business and medium sized business lending,"

VOA: standard.2009.12.20

If someone is detained because they appear ill, a medical expert from the Centers for Disease Control and Prevention comes to the scene to check them and, if necessary, send them back over the border.

VOA: standard.2009.04.30