Wiktionary
bargain away
vb. To dispose of in a bargain, usually with a sense of loss or disadvantage.
Usage examples of "bargain away".
You would bargain away my birthright for the sake of a comfortable old age for yourself.
A wine merchant will pay more for our whole shipment of brandy than you will get for a single keg you bargain away to an innkeeper.
He feared that he would give his bargain away if he were forced into any kind of extended speech.
Better to tell the truth now than let Charlie bargain away his goods and chattels only to discover the prize wasn't his to have.