垫背

垫背	diàn bèi	to serve as a sacrificial victim / to suffer for sb else / scapegoat / to share sb's fate
垫	diàn	pad / cushion / mat / to pad out / to fill a gap / to pay for sb / to advance (money)
背	bēi	variant of 背
背	bēi	to carry on one's back / (fig.) to bear; to shoulder (a burden, blame etc)
背	bèi	the back of a body or object / to turn one's back / to hide something from / to learn by heart / to recite from memory / (slang) unlucky / hard of hearing