scapegoat

n. 替罪的羔羊,替人顶罪者,替身

The accused was used as a scapegoat.

被告成为别人的替罪羊。

The old curmudgeon found a new scapegoat and that let me out.

那个老守财奴找到一个新的替罪羊，这样我就脱身了。