Definition for Yield burning
From Biology Forums Dictionary
A municipal bond financing method. Underwriters in advance refundings add large markups on US Treasury bonds bought and held in escrow to compensate investors while waiting for repayment of old bonds after issuance of the new bonds. Since bond prices and yields move in opposite directions, when the bonds are marked up, they "burn down" the yield, which may violate federal tax rules and diminishes tax revenues.